虎胆的英文：
as brave as a tiger

brave是什么意思：
adj. 勇敢的；壮观的
v. 勇敢面对；敢于冒犯

A brave retreat is a brave exploit.
勇敢的退却也是勇敢的行为。

He was as brave as a lion.
他勇猛如雄狮。

The sight was brave and stirring.
那种景象是壮观的，扣人心弦的。

None but the brave deserve the fair.
英雄才能配美人。

The soldier was as brave as a lion.
那个士兵如狮子般勇猛。

tiger是什么意思：
n. 老虎；凶暴的人

To act as guide to a tiger
为虎作伥

Tyranny is fiercer than a tiger.
苛政猛如虎。

Newborn calves are not afraid of tigers.
初生牛犊不怕虎。

green tiger prawn
短沟对虾

The tiger is a representative of the cat family.
老虎是猫科动物的典型。