虎穴的英文：
the lion's mouth

lion是什么意思：
n. 狮子

He was as brave as a lion.
他勇猛如雄狮。

The lion's share
最大的份额(狮子,驴,狐狸分猎物的寓言故事)

Wake not a sleeping lion
别自找麻烦

A lion is known by his claws
观其爪而知其狮

Beat the dog before the lion.
杀鸡儆猴

mouth是什么意思：
n. 嘴；入口；需要供养的人；讲话方式
v. 不出声地说，言不由衷地说

Live from hand to mouth
勉强糊口

To live from hand to mouth
得过且过

A close mouth catches no flies
病从口入

You've got such a crude mouth!
你说话真粗鲁！

He has ten mouths to feed.
他要养十口人。