see a wolf字面意思“看见一只狼”，可以想象看到一只狼时，目瞪口呆，吓得说不出话来的样子，引申为“张口结舌”。

【例句】
When the teacher asked why he did it, he saw a wolf.
当老师问到他为何干那事时，他张口结舌。

He saw a wolf for a moment, then swayed and sat down.
他一时吓得说不出话来，摇晃着身子坐下。