BSS stands for "block storage segment" (originally, "block started by symbol"), and the memory reserved in the BSS section is initialized to zero during the start of the program.

BSS代表“block storage segment”(原来是以一个符号开头的块)，BSS部分中保留的内存在程序启动时初始化为零。

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The clear_user function is used to zero a block of memory in user space. This function takes a pointer in user space and a size to zero, which is defined in bytes.

clear_user函数被用于将用户空间的内存块清零。

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In this test case, the aggregated per-interval average block time was zero, but in Figure 12, you can observe a feature of some APM visualization tools.

在这个测试用例中，总计的每个时间间隔内的平均阻塞时间为零，但是在图12中，您可以观察到一些APM可视化工具的一个特性。

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-- Else if n is greater than 4 and n is less than 6 -- 7 let's call it medium -- else if n is greater than or equal to 7, -- less than or equal to 10 -- let's call it "big" -- and if the user typed in zero or negative 10 or 20 or whatever, let's just use the all-inclusive else block and just say, "You picked an invalid number."

否则如果n大于4，并且n小于-,我们叫它为中间数--否则如果n大于等于，小于等于10--我们叫它为“大数“,如果用户键入了0或者-10或20或其它的，让我们用一个广泛的else子句，只需要说，“你选了一个非法的数字“

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