The noise was even louder though than this may seem at first, because a pressure gauge located 161 kilometers away measured a sound of 180 decibels.

可是这噪音比初看起还要强，因为在距火山161公里处的一个压力计量到的声音是180分贝。

Once the needle is inserted into the spinal canal, it's attached to a manometer, which is a device that measures the CSF pressure.

椎管的针与体压力计相，量脑脊液压力。

We have a pressure gauge on the side.

我们侧面装有一个压力计。

A manometer is just a U-shaped tube with a fluid inside.

压力计是一个形状像 字母 U 充满液体。

Which is where manometers and barometers come in.

这就是压力计的用武之地。 气压计是大气压计。

And so what happened is as I decreased that volume, what happened to the pressure gauge?

于是，当我减小那个体积时，压力计发生了什么变化？

Then, we covered how manometers and barometers measure pressure.

然后我们讲了压力计的作用机理 气压计是压力表。