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单词 constant maintenance
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原声例句
著名历史人物传记

But it required such precise calibration and constant maintenance that it became obsolete almost as soon as it was released, and left behind by smarter, quicker machines.

但这款排字机需要精确的校准和不断的维护,以至于它几乎刚一问世就被淘汰了,被更智能、更快捷的机器取而代之。

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