Step four: the write system call returns, creating our fourth context switch.
步骤四：系统调用返回，导致了第4次上下文切换。
The send system call returns, creating the fourth context switch.
send系统调用返回，结果导致了第四次的上下文切换。
In modern language context, portrait is not only demand for "creating image".
而在当代的语境下，肖像也全然不再来自“造像”之需。
In modern language context, portrait is not only demand for "creating image".
而在当代的语境下，肖像也全然不再来自“造像”之需。
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