难怪

nán guài tā yǒu diǎn bù gāo xìng

难怪他有点不高兴。

No wonder he was a bit upset.

shì tā zì jǐ bù duì nán guài bié rén duì tā bù mǎn yì

是他自己不对，难怪别人对他不满意。

It's his fault, and it's understandable that they aren't happy with him.

chuāng hu quán dǎ kāi le nán guài fēng zhè me dà

窗户全打开了，难怪风这么大！

All the windows are open, that's why it is so draughty.

tā bù dà le jiě qíng kuàng gǎo cuò le yě nán guài

他不大了解情况，搞错了也难怪。

You can hardly blame him for the mistake he made; he didn't know much about the situation.

tā shì dì yī cì dēng tái biǎo yǎn chū diǎn r chā cuò zhè yě nán guài

他是第一次登台表演，出点儿差错，这也难怪。

It was his first time on the stage, and no wonder he made a mistake.

tā hěn hài pà zhè yě nán guài bì jìng hái xiǎo ma

他很害怕，这也难怪，毕竟还小嘛。

It's understandable that he was frightened; after all, he is only a child.