A graph which shows this variation with time is called a waveform.
电压或电流随时间而变化的图形称为波形。
The mechanical creep in photoelastic models is accompanied by a variation with time of the optical effects.
光弹性模型中的力学蠕变，伴随着光学效应随时间的变化。
At present, surveying gravitational field and its variation with time accurately and detailedly is a main subject of Gravisat.
精密和详细测定地球重力场及其时间变化，是目前卫星重力测量的主要课题。
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