The weak intonation is shown in the following features: low fundamental frequency, narrow pitch range, and the rising of boundary tone.
祈使句语气的弱化通常体现在以下几个方面：降低基频、缩小基频范围、以及抬高边界调。
The intonational phrase is a unit of utterance, possessing an organic prosodic structure, and usually delimited by a pause and a boundary tone, capable of being subdivided into intermediate phrases.
语调短语是一个话语单元，它有相对完整的语调和韵律结构，往往有停顿和边界语调标示；它可以再切割成语调次短语。
The intonational phrase is a unit of utterance, possessing an organic prosodic structure, and usually delimited by a pause and a boundary tone, capable of being subdivided into intermediate phrases.
语调短语是一个话语单元，它有相对完整的语调和韵律结构，往往有停顿和边界语调标示；它可以再切割成语调次短语。
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