The upper two layers represent processes selected by managers and imposed upon the lower levels for strategy and control purposes.
上面的两个层次代表过程是由管理人员选择的，他们为了策略和控制的目的强加了下面的层次。
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。
Like the CORE of earth, the mantle can also be divided into two concentric layers, the lower mantle and the upper mantle.
就像地球的核部一样。地幔也可分为两个同心圆圈层，下地幔和上地幔。
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