难怪 nánguài no wonder (that...)
(it's) no wonder (that...); (it's) not surprising (that)
How to remember 难怪: 难 difficult + 怪 unusual = no wonder (that...).
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How it is used
- No wonder - signals a sudden realization once the cause is known - 难怪他没来，原来病了 (nánguài tā méi lái, yuánlái bìng le) no wonder he didn't come - turns out he was sick.
- Very common in speech; often paired with 原来 (as it turns out) to reveal the explanation.
- Functions as a sentence-opener; contrast 怪不得 (guàibude), a near-synonym with the same 'no wonder' meaning.