Return lines need not be shown in entirety unless necessary to the understanding of the system.
AA. 除非有必要了解系统，否则不需要完整地显示回流管。
BB. 如果没有必要了解系统，则需要完整地显示回流管。
CC. 除非需要了解系统，则需要部分地显示回流管。
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