19. Two is company but three is none.

【正确理解】两人成伴，三人不欢。

20. Students are still arriving.

【正确理解】学生还没有到齐。

21. They went away as wise as they came.

【正确理解】他们一无所获。

22. I won't do it to save my life.

【正确理解】我死也不会做。

23. I don't think his painting is any better than yours.

【正确理解】我认为他的画比你好不到哪去。

24. You don't want to do that.

【正确理解】你不应该去做。

25. Rubber easily gives way to pressure.