为了提高结构的动态刚度，可通过修改直线滚动导轨的结构，使低阶模态频率相应提高。
The dynamic characteristic of linear rolling guide affected by modal frequency and modal shape was studied.
表明这一迹象的是撞击掀起的尘土中显示的红外线光谱中的一些谱线，其频率与水分子能量激发时所发出光线的频率相应。
The telltales are specific "lines" in the spectrum of infra-red light from the plume. These correspond to the frequencies of light given off when water molecules are energetically excited.
如果有一种特定类型的操作经常执行，那么相应任务的频率可以增加以降低每一项任务必须执行任务的数量。
If a particular type of operation is performed often, the frequency of the corresponding task can be increased to reduce the amount of work each task has to perform.
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