In this case, I perform a test to make sure the column location isn't null.

在这里，我执行了一个测试来保证列位置不为null。

youdao

Many electronic voting machines have clocks in them that can be set forward to the day of the election to perform a test.

许多电子投票机内都设有时钟，可以直接将时间快转设定成投票日来进行测试。

youdao

Many electronic voting machines have clocks in them that can be set forward to the day of the election to perform a test.

许多电子投票机内都设有时钟，可以直接将时间快转设定成投票日来进行测试。

youdao