They form a grammaticalization sequence and the action weakens gradually. And the semantic change is closely related to the syntactic context of pivotal construction.
这三种意义形成一个意义逐渐虚化、动作义不断减弱的序列，这种语义变化与其处于兼语式的句法环境密切相关。
It is reasonable to say that the prepositions of Chinese may be a syntactic result of the semantic demotion of some non-terminating verbs in the serial verb construction or the pivotal construction.
可以说，汉语介词可能是一部分非终结动词在连动结构或兼语结构中由语义降级而产生的句法后果。
Constructing the troops of teacher is a pivotal matter of subject construction.
师资队伍建设是学科建设的关键问题。
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