英语语法分析

The fashionable method of pulsewidth modulation (PWM) is applied.

在调制方法上采用流行的脉宽调制（PWM）。

Now pulsewidth modulating technology is widely used in pulse power needed by electric spark fine machining.

当今脉宽调制技术在电火花微细加工所使用的脉冲电源中得到广泛应用。

The design principle and experiment results of wide frequency band measurement of ps laser pulsewidth are given.

给出了皮秒激光脉冲宽度带测量的设计原理和实验结果。