He had made a thorough investigation. No wonder he knew so much about it.

　　他對此事做了徹底的調查，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.

　　難怪找不到人，都開會去了。

　　No wonder she looks so familiar; she is my former student.

　　她是我過去的學生，怪道覺得很眼熟。

　　The door was locked, so it's no wonder you couldn't open it.

　　門是鎖著的，無怪你打不開。

　　No wonder her fingers are stained brown, she smokes like a chimney.

　　她煙抽得很厲害，難怪她的手指都熏黃了。