It provides a number of functions that are used by upper - and lower-level drivers and, therefore, serves as the glue between these two distinct layers.
它提供了很多可供较高层和较低层驱动器使用的函数，因而可以充当这两层间的连接层。
The unloader: The unloader that you have serves two functions, a regulator and an unloader.
减压器：你们的减压器有两个功能，作为调节器和减压器。
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