The structural characteristics of the tools, operating principle and the field usage situation are introduced.

介绍了该工具的结构特点、工作原理及现场使用情况。

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Switch to the column properties and set the field usage type of all columns except the ones starting with DC to supplementary.

切换到Column properties并设置除用DC启动的所有列的字段使用类型为supplementary。

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Any additional data could be placed in here, but in usage so far, this field is generally left empty.

任何附加的数据都可以放置在这里，但是，在到目前为止的使用中，这个域通常是空的。

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At the same time, the matters of providing with cooperation of science with practice in the field of usage of underground water become more important.

UNESCO: OFFICE IN TASHKENT

Tablets started off as rugged devices for heavy-duty industrial and field-service usage.

FORBES: What is the Ultimate Ruggedized Mobile Device?