a piece of special glass that you can look at and see yourself in

镜子:

She was studying her reflection in the mirror.

她正在端详镜子中的自己。

He spends hours in front of the mirror !

他老是照镜子！

When I looked in the mirror I couldn't believe it. I looked fantastic!

面对镜子我简直不敢相信，我看上去棒极了！

a mirror on the inside or side of a vehicle, which the driver uses to see what is behind

〔装在车里或车两侧的〕镜子:

Check your rear-view mirror before you drive away.

开车离开之前要先看看后视镜。

a wing mirror

（装在车外侧的）后视镜

a mirror of sth, something that gives a clear idea of what something else is like

反映某事物的一面镜子:

We believe the polls are an accurate mirror of public opinion.

我们认为这些民意测验是准确反映社会舆论的一面镜子。

if one thing mirrors another, it is very similar to it and may seem to copy or represent it

反映〔相似的情况等〕:

Henry's sad smile mirrored that of his son.

亨利脸上那苦涩的笑容跟他儿子一模一样。

The economic recovery in Britain was mirrored in the US.

英国的经济复苏在美国得到了呼应。