The associates I hired in my bicycle shop were never perfect; however, they were excellent.
我的自行车店雇佣的员工是不完美的，可是他们都很优秀。
His English is really excellent.; His English is perfect.
他的英语真过得硬。
However, "excellent" in this context is not "perfect," since each time a process is context-switched it stops operating — which then results in throughput delays (and performance degradation).
但是，在执行上下文切换时，虽然现代操作系统表现很“出色”，却并非“完美无缺”，因为进程在每次进行上下文切换时，它都将停止运行——这将导致吞吐量出现延迟(和性能下降)。
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