If you are on a treadmill watch your head movement in a mirror.
如果你在跑步机上跑，在镜子里观察一下你的头部的运动。
Watch is on the watch glass, which is another name for a watch mirror.
表蒙是我们对手表玻璃，即手表镜面的另一种叫法。
I'll show you how to use it. Hold this hand mirror and watch me.
我做给你看怎么用的。拿着这把手镜，瞧着。
Watch yourself in a mirror while talking on the phone.
打电话的时候在镜子里观察你自己。
Watch yourself in a mirror while talking on the phone.
打电话的时候在镜子里观察你自己。
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