Before doing so, we need to delete any fields that may already exist by that name.

在这样做之前，我们需要删除也许已经以那个名字存在的任何域。

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You can add a column directly or delete the fields from existing columns to make room.

您可以直接添加一个列，或者从已存在的列中删除掉字段以腾出空间。

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By using the fields and the methods above, you can create new rows, update them, and delete them.

通过使用上面的字段和方法，可以创建新行、更新行和删除行。

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They inspect the TV pictures we have filmed which show little more than the fields of northern Iran and order us to delete the footage.

BBC: Why Azerbaijan is closer to Israel than Iran