This will be the reference level for reporting indication amplitude.

译成指示幅度就比较别扭了。

The chamber is first filled to a reference level and the volume recorded.

把水银装入容器中达到一个参考高度，记录此时的水银体积；

This is the most convenient reference level for most electrostatic problems.

对大多数的静电问题来说，这是最方便的参考点。

So this phase is in whole for reference level is very important, the hope causes enough attention.

所以这个阶段在整个备考阶段都是非常重要的，希望引起足够的重视。

The height of a thing above a reference level, especially above sea level or above the earth's surface.

海拔，高度特定水平线上的高度，如太阳或星辰之于地平线之上者；