external feedback type oscillator circuit 外反馈式振荡电路
external shoulder oscillator 长线槽路正弦振荡器
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The external potential has many forms, such as harmonic oscillator potential, optical lattice potential, elliptic function potential, double well potential, and so on.
外势有许多形式：简谐外势、光晶格外势、椭圆函数外势、双阱外势以及含时线性外势等等。
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