它是通过执行一个具有标准参数值的特殊停止和信号汇编指令实现的。

It does so by executing the special stop-and-signal assembly instruction with a standardized argument value.

youdao

就光圈优先模式来说，光圈是最主要的参数，所以你并不需要再按光圈按钮，直接转动指令盘并且在LCD上查看数值变化即可。

Since aperture is the main event in aperture priority mode, you may not need to press the aperture button; simply rotate the command dial and look for the changing Numbers in the LCD status screen.

youdao

print 指令发出标准输出（stdout）的参数，且 concat 实现字符串连接。

The print instruction emits the argument to standard output (stdout), and concat implements string concatenation.

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