However, it may be necessary to increase the damping with an external circuit.
然而有的时候，可能需要使用外部电路来增加衰减作用。
2
The damping circuit may already be built into the electrometer or may be an external circuit.
衰减电路可以装在静电计的内部，也可以是一个外部电路。
3
External elastic damping support, if designed reasonably, may obviously improve the natural or forced vibration response characteristics of bearing rotor systems.