A gust of wind knocked him off balance and he fell face down in the mud.

一阵大风吹得他失去了平衡，脸朝下摔在了泥里。

He tried to use his own weight to push his attacker off but he was off balance.

他试图利用自己的重量推开袭击者，但他失去了平衡。

The impact of the blow knocked Jack off balance.

这一记猛击把杰克打了个趔趄。

I was thrown off balance by the sudden gust of wind.

突如其来的一阵风差点儿把我吹倒。

The senator was clearly caught off balance by the unexpected question.

参议员显然因这意想不到的问题而不知所措。