阅读里的时间概念和一个句子，搞不懂...

落音雨

in the last five years
in the preceding five years
in the previous five years

大神啥区别哇？


In these tropical regions, diurnal(daytime) visitors to columnar cactus flowers are ineffective pollinators because, by sunrise,（？？） the flowers' stigmas （柱头）become unreceptive or the flowers close.

这个 by sunrise啥意义，到太阳升起时，但是原文想表达的是before sunset，大神讲讲吧

落音雨

一抹斜阳 发表于 2017-12-11 12:34
顶楼主！

谢谢

一抹斜阳

顶楼主！