她最初只是一名基层员工，现在已经是部门经理了。

She started as a ___low-level staff member but is now a department manager.

这个软件适合初学者，因为它只包含一些基础功能。

This software is suitable for beginners as it only includes some ___low-level features.

潜水员在深水区发现了低层的珊瑚礁。

The divers found ___low-level coral reefs in the deep water.