Control systems are usually kept entirely separate from other systems, for good reason.
出于安全的原因，控制系统通常都和其它系统完全分开。
She said good-bye and, for the first time , they went their separate ways .
他向他道别，他们第一次各走各的路。
She said good-bye and, for the first time , they went their separate ways .
他向他道别，他们第一次各走各的路。
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