All information about the removed subitem is deleted.

有关已移除子项的所有信息都被删除。

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A parent item is the item that has some other subitem associated with it.

一个父选项有很多和它关联的子项。

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To set a check in every subitem , you check the checkbox in the column header.

要设置在每一个分项目检查时，检查的列标题复选框。

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