per quod的用法和樣例：
例句
- The pair spent much of the race trading places, often a number of times per lap.
他倆在比賽的大部分時(shí)間都膠著(zhù)在一起，基本上每圈都因此多花了一些時(shí)間。 - Demand for cement is growing faster than emissions per tonne are falling, leading to an overall increase in emissions.
一個(gè)多世紀以來(lái)，水泥生產(chǎn)商們一直致力于提高煤窯的燃燒效率，因此能夠大幅提高的空間相對來(lái)說(shuō)不大。
