He had made a thorough investigation. No wonder he knew so much about it.
他对此事做了彻底的调查，怪不得他了解得那么多。
No wonder you can't find anybody here; they're all away at a meeting.
难怪找不到人，都开会去了。
No wonder she looks so familiar; she is my former student.
她是我过去的学生，怪道觉得很眼熟。
The door was locked, so it's no wonder you couldn't open it.
门是锁着的`，无怪你打不开。
No wonder her fingers are stained brown, she smokes like a chimney.
她烟抽得很厉害，难怪她的手指都熏黄了。