使用单稳态触发电路作“延时”或“定时”用，由于受到元件和器件的影响，其精度不会太高。

The accuracy of delay or timing is not sensitive with monostable trigger circuit since electrical elements have influence on it.

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事件延迟，毫秒。如果这个值不在定时器支持的最小和最大延时之间的话，函数将返回一个错误。

Event delay, in milliseconds. If this value is not in the range of the minimum and maximum event delays supported by the timer, the function returns an error.

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设计了一个由微波发射器、555定时器、电压比较器和继电器组成的具有延时功能的自动报警器。

The paper designs an automatic alarm with the time delay function which composed by the microwave launcher, 555 timers, the voltage comparator and the relay.

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