a last resort的用法和樣例：
例句
- He discovered that all grassland squirrels made straight for the trees when pursued, and only chose holes in the ground, or hollow logs, as a last resort.
他發(fā)現，所有的草地松鼠當被追捕時(shí)，首選都是直爬上樹(shù)，實(shí)在沒(méi)有辦法時(shí)才選擇地洞或中空的木鉆。 - As a last resort, go away and never come back.
不得已，就走開(kāi)別再回來(lái)。
