During the Petrochemical PTA
plant upgrade, the production capacity was expanded from 225 Kt/a to 400 Kt/a while achieving a 32% reduction in overall
energy consumption.这句话应该没有语法错误,但是这个while achieving的逻辑主语是哪个呢?
Among children with parents who ranked high on the socioeconomic scale,
participation in high school sports has increased.这里的rank high,为什么rank 后加的是形容词?