为了检查获取状态，这个子过程周期性地获取后台文档。
In order to check on the retrieval status, the sub retrieves the back-end document periodically.
为了检查 LDAP 设置是否有问题，需要执行以下步骤
To check if there is a problem with the LDAP settings, follow these steps
为了检查这些地里工程学模式是否奏效，我们还需要展开一些小规模的实验。
To see whether any form of geoengineering could work, though, small-scale experiments need to be carried out.
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