The function of the period-of-time words is restricted by rhythm.
时段词语的功能也会受到韵律的制约。
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时量词语可以在动词前或后出现，除了在一些特殊结构外，动词前的时量词语一般不表示持续时段。
Words of time-quantity can be placed before or after a verb but the preverbal ones usually do not express span of duration except in some particular structures.
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