adj. 1.开着的，开放的；可进入的，可分享的 (to); 无盖的，敞口的；敞开的；展开的；开的；开阔的，开旷的，广漠的。 2.公开的，公共的，出入自由的；自由的，无限制的。 3.宽大的，豪爽的，豁达的；易受…的 (to); 议论自由的，有议论余地的；未决定的；未决算的；取舍自由的，选择自由的；【军事】不设防的。 4.坦白的，直率的；公然的，非秘密的。 5.(商店、展览会等)开着的；(戏院)开演着的；活动着的。 6.【语音】开口音的；末尾为母音音节的；【音乐】不用指按的，开键的；空弦的。 7.有空的，有空隙的；(针织品)粗疏的；【印刷】版面疏松的。 8.(河等)没有冰凉的；冰雪不厉害的，(天气)温和的。 9.〔美国〕无法律限制的，公许的，(赌场)不受禁止的；不征收关税[通行税等]的，(港)自由的。 10.【医学】(大便)畅通的。 短语和例子 an open window 开着的窗子。 an open boat 无甲板的船。 an open car 敞篷车。 an open field 空旷的田野。 an open road 畅通无阻的道路。 the open sea 公海。 an open port 不冻港；自由港，通商口岸。 an open shop 〔美国〕自由雇用企业〔指可自由雇用非工会会员的工厂[商店]〕。 an open system 外通系统。 an open winter 无冰冻的冬天。 the open water in arctic regions 北极地区的不冰封海面。 leave the matter open 把事情搁着暂不解决。 There are three courses open to us. 我们有三条路可以走。 an open account 往来账户。 an open season [time] 渔猎解禁期。 The bowels are open. 【医学】大便畅通。 be open to 1. 易接受 (He is open to advice. 他容易接受忠告)。 2. 易受 (The city is open to attack. 该市易受攻击)。 3. 对…开着门。 be open with sb. about sth. 关于某事对某人毫无隐瞒。 in the open air 在户外[野外]。 keep an open door [house, table] 欢迎来客，好客。 keep one's eyes [ears] open 留心地看着[听着]；保持警惕。 open as the day 光明磊落，开诚布公。 throw open the door to 送机会给…，迎接…。 with an open hand 大方，慷慨。 with open arms 张着手臂，热烈(欢迎)。 with eyes open ＝with open eyes 睁着眼睛；留神；吃惊地。 with open hands＝with an open hand. with open mouth 1. 张着口，想说。 2. 天真地。 3. 哑然；伸长脖子(等)。 n. 〔the open〕空地，旷场，旷野；汪洋大海；露天，户外。 be in the open 是公开的。 come (out) into the open 公开；表明心意。 in open 公然。 in the open 露天，在户外。 vt. 1.开；打开；【医学】切开，割开(腹部等)；开垦，开发，开辟，启发。 2.公开，开放；张开(翅膀)，伸开，展开；【军事】疏开(队列)；开始；开立；开设。 3.泄露；揭开；表明 (to)。 4.解释，说明，论。 5.【航海】(改变船位)来到看得见…的地方。 6.【电学】断(电路)。 7.通(便)。 open a door 开门。 open a park 开放公园。 open a debate 开始辩论。 We opened a white pagoda to the port. 【航海】左舷方面看出一座白塔来了。 vi. 1.开；张开；裂开；(花)开；(疮等)开口；变广(大)；(知识等)发达；广阔地展开；(门、窗等)通向 (to into) 朝，向 (on)。 2.开始 (with) (猎狗嗅出鸟兽)吠起来；〔蔑称〕(人)开口，说起话来。 3.【航海】(方向变化的结果)看得见；现出；展现。 4.散开；翻开；开炮。 短语和例子 Parliament opens today. 议会今天开会。 The ranks opened. 队伍散开了。 O- at page 12. 请翻开第12页。 open fire (on, at) (向…)开炮。 open into [on,onto]…通到，通向。 open one's eyes 睁眼；吃惊；使觉悟，启发。 open out 开，张开，膨胀，展开；发展，发育；展现；出现；开诚布公，倾吐衷怀；【物理学】加速(open out to each other 互相融洽起来)。 open the door to 给…大开方便之门，给…造机会。 open up (打)开；割开；开发(资源)；揭示；展现；开辟(可能性)；开始；开火；开口(说话)；滔滔不绝地谈；透露。 open upon 朝向，俯瞰；展望。 n. -ness 开放；公开；坦白；无私；宽大。
affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open" 同义词：unfastened,
affording free passage or access; "open drains"; "the road is open to traffic"; "open ranks"
used of mouth or eyes; "keep your eyes open"; "his mouth slightly opened" 同义词：opened,
(set theory) of an interval that contains neither of its endpoints
open and observable; not secret or hidden; "an overt lie"; "overt hostility"; "overt intelligence gathering"; "open ballots" 同义词：overt,
ready or willing to receive favorably; "receptive to the proposals" 同义词：receptive,
ready for business; "the stores are open"
not having been filled; "the job is still open"
openly straightforward and direct without reserve or secretiveness; "his candid eyes"; "an open and trusting nature"; "a heart-to-heart talk" 同义词：candid, heart-to-heart,
without undue constriction as from e.g. tenseness or inhibition; "the clarity and resonance of an open tone"; "her natural and open response"
affording free passage or view; "a clear view"; "a clear path to victory"; "open waters"; "the open countryside" 同义词：clear,
having no protecting cover or enclosure; "an open boat"; "an open fire"; "open sports cars"
open to or in view of all; "an open protest"; "an open letter to the editor"
with no protection or shield; "the exposed northeast frontier"; "open to the weather"; "an open wound" 同义词：exposed,
accessible to all; "open season"; "an open economy"
not sealed or having been unsealed; "the letter was already open"; "the opened package lay on the table" 同义词：opened,
not brought to a conclusion; subject to further thought; "an open question"; "our position on this bill is still undecided"; "our lawsuit is still undetermined" 同义词：undecided, undetermined, unresolved,
(of textures) full of small openings or gaps; "an open texture"; "a loose weave" 同义词：loose,
possibly accepting or permitting; "a passage capable of misinterpretation"; "open to interpretation"; "an issue open to question"; "the time is fixed by the director and players and therefore subject to much variation" 同义词：capable, subject,
not requiring union membership; "an open shop employs nonunion workers"
not defended or capable of being defended; "an open city"; "open to attack" 同义词：assailable, undefendable, undefended,
make available; "This opens up new possibilities" 同义词：open up,
become available; "an opportunity opened up" 同义词：open up,
make the opening move; "Kasparov opened with a standard opening"
cause to open or to become open; "Mary opened the car door" 同义词：open up,
become open; "The door opened" 同义词：open up,
spread out or open from a closed or folded state; "open the map"; "spread your arms" 同义词：unfold, spread, spread out,
display the contents of a file or start an application as on a computer
afford access to; "the door opens to the patio"; "The French doors give onto a terrace" 同义词：afford, give,
begin or set in action, of meetings, speeches, recitals, etc.; "He opened the meeting with a long speech"
start to operate or function or cause to start operating or functioning; "open a business" 同义词：open up,
have an opening or passage or outlet; "The bedrooms open into the hall"
information that has become public; "all the reports were out in the open"; "the facts had been brought to the surface" 同义词：surface,
a tournament in which both professionals and amateurs may play
where the air is unconfined; "he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open" 同义词：outdoors, out-of-doors, open air,
a clear or unobstructed space or expanse of land or water; "finally broke out of the forest into the open" 同义词：clear,
例句与用法
1.
The opening of the iris is called the pupil . 虹膜的开口处叫做瞳孔。
2.
The drawer is so tight that i can't open it . 这抽屉太紧，我打不开。
3.
She tore it open and carried it to the lamp . 她拆开来拿到灯旁去看。
4.
Open the window and let in some fresh air . 打开窗户放进些新鲜空气。
5.
Her mother came out of an open door . 她妈妈从一扇开着的门里走出来。
6.
His mouth was open and his eyes bugging . 他嘴张着，眼珠都鼓了出来。
7.
Nasa officials opened a broad inquiry . 宇航局官员开始进行广泛调查。
8.
The railway was opened to traffic last year . 这条铁路是去年通车的。
9.
My little cousin, maggie, opened the door . 我的小表妹麦吉打开了门。
10.
It 's easy to open a shop but hard to keep it open . 创业容易守业难。
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