B-3: be at one's wits' end 不知如何是好

　　A：Does he know that he's already at his wits' end?

　　A：他知不知道他已经山穷水尽了?

　　B: I think he's realized that. But he's still whistling in the dark by putting up an act.

　　B：我想他已经意识到了，但他仍装腔作势为自已壮胆。

　　A: He might be driven up a wall. You should handle your relation with him with kid gloves.

　　A: 他快被逼得走投无路了，你应该以温和的手段对付他。

　　B: But when I noticed that he was left in the cold, I couldn't help wanting to help him to get out of the situation.

　　B: 但当我看到他已是孤家寡人的时候，我又不由自主地想帮助他摆脱这种状况。