为了做到完全结合，这两个输入的脉冲信号必须在同一时刻到达。——就象这种情况，两个人去推开一扇很重的大门。

In order to combine properly, those two incoming impulses must arrive at nearly exactly the same time - sort of like two people running at a heavy door to push it open.

youdao

或者换句话说，脉宽调制是一种调制技术，为发电可变脉冲宽度为代表的幅值输入模拟信号或波。

In other words, pulse width modulation is a modulation technique for generating variable width pulses to represent the amplitude of an input analog signal or wave.

youdao

当主控门打开时，经过转换的输入信号脉冲通过它进入计数寄存器，并在此统计，然后通过显示电路输出。

While the main gate is open, the conditioned input signal pulses are passed through to the counting register, where they are tallied and then scaled for output by the display circuitry.

youdao