怪不得她今天不来上课。
guàibùdé tā jīntiān bù lái shàngkè 。
No wonder she didn't come to class today.
怪不得他们的成绩那么好。
guàibùdé tāmen de chéngjì nàme hǎo 。
No wonder their grades are so good.
我明白了,怪不得你这么忙。
wǒ míngbái le , guàibùdé nǐ zhème máng 。
I understand now, no wonder you are so busy.