重点讲解：
1. run out of 用完；耗尽；
例句：He has run out of red ink.
他的红墨水用完了。
2. in danger 处在危险中；
例句：Some animals feign death when in danger.
有些动物在危险时装死。
3. cheer up （使）高兴起来；（使）振作起来；
例句：Cheer up! It can't be as bad as all that.
振作起来！情况不会那么糟。
4. add to 添加；增加；掺加；
例句：That considerably added to our difficulties.
那事给我们增添了相当大的困难。
5. keep the wolf from the door 勉强度日；糊口；
例句：A lot of the lads took small jobs to help keep the wolf from the door.
很多少年打零工帮补家里维持生计。
6. struggle to do sth. 奋力；努力；尽力；
例句：Those who have lost their jobs struggle to pay their supermarket bills.
那些失业的人们想方设法以支付超市的账单。

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