The use of a marked theme, which is selective, results from its certain rhetorical effects.

选用有标记主位与句子需表达的某种修辞效果有关。

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At the clause stratum, a locative prepositional phrase functions to foreground the temporal location as a marked theme while it functions to background the spatial location.

在小句层面，处所介词短语把时间处所前景化为有标记主位，而把空间处所背景化。

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At the clause stratum, a locative prepositional phrase functions to foreground the temporal location as a marked theme while it functions to background the spatial location.

在小句层面，处所介词短语把时间处所前景化为有标记主位，而把空间处所背景化。

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