Pre-Delay（预延迟）：模拟大房间中的混响反应，是在混响开始发声作用前先产生一个短小的延迟，也就是信号出现以后和它开始在房间的表面进行反射之前...
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UPDATE_NOTE操作确实因此而延迟一些，但有趣的是，这个模式不会随着预读取值的增加而延迟得更多。
UPDATE_NOTE operations did suffer some additional latency but, interestingly enough, this pattern did not increase with higher read-ahead values.
在获取每条指令期间会出现某种延迟，可以通过预取指令并对其进行存储以用于后续的执行，从而避免延迟。
Fetching each instruction involves a certain latency that can be avoided by prefetching instructions and storing them for later execution.
因为测量的引发是由脉冲的前导沿控制的，除非设置一定的预触发延迟，否则会丢失部分脉冲、造成频谱失真。
Since the measurement initiation is controlled by the leading slope of the pulse, part of the pulse is lost and the resulting spectrum is distorted unless some pretrigger delay is specified.
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