1. 英譯漢:
Love well, whip well.
愛之深,責之切。
不打不成器。
2. 漢譯英:
說曹操曹操就到。
Speaking of the devil, and here s/he comes.
3. 習慣用語:Your guess is as good as mine.
An example use in a sentence:
Are we going to have a government shutdown again?
No clue; your guess is as good as mine.