The （）view of language sees language as a linguistic system made up of various subsystems: the sound system (phonology); the discrete units of meaning produced by sound combinations (morphology); and the system of combining units of meaning for communication (syntax).

对强油循环的变压器，在按规定程序开启所有油泵（包括备用）后整个冷却装置上不应出现负压。（）