无光驱。
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。
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。
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。
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