无光驱。
An external optical drive can be the resolution to the problem, that's for sure.
外置光驱可以解决的问题，这是肯定的。
The two major components are: a mechanical drive system and an optical system.
两个主要部件为：一是机械传动系统，另一个部件为光学系统。
The two major components are: a mechanical drive system and an optical system.
两个主要部件为：一是机械传动系统，另一个部件为光学系统。
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