介词短语所做的成分

The number is expected to rise to 75.6 million by 2030, up from about 44.4 million in 2013.

请问 up from about 44.4 million in 2013作什么成分？

The number is expected to rise to 75.6 million by 2030, up from about 44.4 million in 2013.

up from about 44.4 million in 2013 是个非限制性定语，修饰前文的75.6 million。相当于：which is up from about 44.4 million in 2013

up 是副词（上升），from 含有“比较”意味，类似different from...中from 的用法。又如：

This amount is up from $ 429 in 1989.

这个数目比1989年的429美金上升了。

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曹荣禄 1秒前

擅长：动词用法,句法问题

The number is expected to rise to 75.6 million by 2030, up from about 44.4 million in 2013.

up from about 44.4 million in 2013 为非限制定语，修饰75.6 million。

不宜将其分析为不定式to rise的状语。因为rise本身就是上升的意思，再用副词up就是多余。