She crept upstairs, quiet as a mouse.

她像耗子一样悄悄地爬上楼去。

She crept downstairs (as) quiet as a mouse.

她蹑手蹑脚，悄声下了楼。

The child sat as quiet as a mouse, hardly touching her food, except the little roll.

海蒂像老鼠一样安静地坐着，除了那一小卷面包外，几乎不吃东西。

She sat there quiet as a mouse.

她坐在那儿，象耗子一样一动不动。

I'll hide as quiet as a mouse.

我会安静得像只耗子。