If you gradually move your tongue forward towards the th-sound, stopping halfway, your tongue will be behind your teeth, and the pitch will get higher.

假如你渐渐将舌头前移向发 th 声所在的位置，然后半路停下，你的舌头会停在你的牙后，同时音调会升高。

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For example, you can brush the outer sides of your teeth from left to right across the top, then move to the inside and brush right to left.

比如，你可以从左至右从顶端刷你的牙齿的外面，然后移到里面从右至左。

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She clenched her teeth and refused to move.

她咬紧牙关不肯挪动一步。

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I move out of the room toward the bathroom, planning to brush my teeth. As I enter the bathroom, it's much more light, I look in the mirror and-- here's where things get really weird--I don't see anything.

我离开卧室走向浴室,要去刷牙,当我走进浴室时,光线明亮了些,我看着镜子,从这里情节就诡异了,我什么也没看到

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