怪不得

1. no wonder; so that's why; that explains why

♦ ~多一张票, 她把自己的让出来了。 So that's why (or No wonder) there's an extra ticket. She has given hers up.

2. not to blame

♦ 他来晚了, ~他, 因为开会时间通知错了。 He's not to blame for arriving late. He was told the wrong time for the meeting.