本文讨论了信号处理中的一个基本问题——复信号以正交实信号表示时的模值计算。

This article discusses how to find out the amplitude of complex expressed by quadrature real signals, which is a fundamental problem in signal processing.

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并利用类可饱和吸收体实现被动锁模的自启动条件，给出了用小信号光斑变化量表示的克尔透镜锁模启动条件。

The self-starting condition expressed by the small signal spot size variation is demonstrated, according to the passive absorber-like self-starting condition.

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但是杨利伟表示说他再也没有听到过一模一样的声音。

But Yang said he had never heard the exact sound again.

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If you drop the arrow, it's the usual convention, if you're talking about the length of the vector A.

如果你把箭头去掉,就表示矢量 A 的模长,这是约定俗成的

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A is the length of A.

表示矢量 A 的模长

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