birds
A bird is a creature with feathers and wings. Female birds lay eggs. Most birds can fly.
birds of a feather
If you refer to two people as birds of a feather, you mean that they have the same interests or are very similar.
We're birds of a feather, you and me, Mr Plimpton.
普林顿先生——你和我,我们志趣相投。
a bird in the hand
A bird in the hand is something that you already have and do not want to risk losing by trying to get something else.
Another temporary discount may not be what you want, but at least it is a bird in the hand.
再一次临时打折可能达不到你所希望的,但至少这是已经到手的东西。
little bird
If you say that a little bird told you about something, you mean that someone has told you about it, but you do not want to say who it was.
Incidentally, a little bird tells me that your birthday's coming up.
顺便提一句,有个消息灵通的人告诉我你的生日快到了。
kill two birds with one stone
If you say that doing something will kill two birds with one stone, you mean that it will enable you to achieve two things that you want to achieve, rather than just one.
We can talk about Union Hill while I get this business over with. Kill two birds with one stone, so to speak.
我们可以谈谈尤宁山,同时我把这件事干完。可以说是一举两得吧。