He is too timid to venture upon an undertaking.

他太小,不敢从事任何事业。

I was too timid to ask for what I wanted.

我太小，不敢要求自己想要的东西。

He is timid by nature.

他生性小。

A shot of Hagemura the Violet Turaco, somewhat timid one with poor crest. It looked fast asleep, leaning agaist the perch. Such a sight made me sleepy as well.....

这是亲密接触小径的有点小的哈格木拉，看来它也是热得一点力气都没有。它懒洋洋地靠在树上睡得多香，看到它睡得那么舒服，我照着照着也跟着困起来。