Budget: to be careful about the amount of money you spend; to plan to spend an amount of money for a particular purpose 谨慎花钱；把…编入预算
If we budget carefully we'll be able to afford the trip. 我们精打细算一点，就能够负担这次旅行。
I've budgeted for two new members of staff. 我已经把两名新职员名额编入预算。
Ten million francs has been budgeted for the project. 为该工程已编制了一千万法郎的预算。
The project has been budgeted at ten million francs. 该工程已制定一千万法郎的预算。

Incidental: something that happens in connection with something else, but is less important 附带的次要事情
You'll need money for incidentals such as tips and taxis. 你将需要准备好付小费和乘出租车之类的杂项开销。

Buffer: a thing or person that reduces a shock or protects somebody/something against difficulties 缓冲物；起缓冲作用的人
Support from family and friends acts as a buffer against stress. 家庭和朋友的支持有助于减缓压力。
She often had to act as a buffer between father and son. 她常常不得不在父子之间扮演调解人角色。
a buffer state(= a small country between two powerful states that helps keep peace between them) 缓冲国(两敌对大国之间有助于维持和平的小国家)
a buffer zone(= an area of land between two opposing armies or countries) 缓冲区（两敌对军队或国家之间的地区）

make a killing: to make a lot of money quickly 发大财;获取暴利;财运亨通

来源:恒星英语-口语频道
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