oscillate 雅思托福GRE

On an oscilloscope, you can see an electrical current oscillate up and down.

在示波器上面可以看到一股电流上下振动。

Definition form Wikipedia: A degauss causes a magnetic field to oscillate rapidly, with decreasing amplitude.

基百科的定义：消磁器产生幅度递减的快速交变磁场。

The temperature at Earth's exobase oscillates but is typically about 1,000 kelvins, implying that hydrogen atoms have an average speed of five kilometers per second.

地球外气层底的温度是不断变动的，不过通常约是1000K，使得氢原子平均的速度为每秒5公里。