Check the validity of a board at any stage.
在任何的阶段检查董事会的有效性。
How to: Check the Validity of a Cached Page.
如何：检查缓存页的有效性。
Take the time to check out the validity of an offer.
花时间检验提议方的合法性。
The third officer should often check the number of life-saving signals, validity and status.
三副应当经常检查救生信号的数量，有效期和状况。
The third officer should often check the number of life-saving signals, validity and status.
三副应当经常检查救生信号的数量，有效期和状况。
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