Y structure and function, BLSS can be divided into two parts: autotrophic unit and heterotrophic unit.
LSS在结构和功能上可以分为自养单元和异养单元两部分。
By introducing the structure and function of testing unit, this paper makes user understand the theory of the system further, and provides guidance to the operation and maintenance.
通过介绍测试装置的组成和功能，让使用者从理论上进一步了解该系统，以指导该装置操作和维护工作。
The deep structure can mostly be presented as the surface structure made up of an active sentence or a passive one, by means of the unit noun characteristic of transformation function.
该深层结构多半可以通过单位词的转换功能映现为主动句或被动句的表层结构。
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