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
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发表于 2017-12-5 20:08:07
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