... operational form 算子式 operational key 操作键 operational label 操作标号 ...
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... Windows Media Player Windows媒体播放器 function key功能键，操作键 voice recognition module语音识别模块 ...
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那么，选择就在任意键的更好性能和操作键的更易维护之间进行。
The choice, then, is between better performance of an arbitrary key and easier maintenance of an operational key.
用专用扳手按指示要求转动操作键90度即可实现开关。
With special spanner according to instruction and requirement to roll operational key 90 degree, so that can achieve to open and close.
另一种就是存储操作键，并且在必要时，存储时间戳作为维度上的属性数据。
The other is to store the operational keys and, if necessary, time stamps as attribute data on the dimension.
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