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1.a herd of 一群
A herd of about 100 African buffalo meanders quietly along a riverbank.
一群非洲水牛，大约100只，安详地顺着河岸漫步。
2.at present 目前
I don't need the dictionary at present.
我现在不需要这本字典。
3.out of the ordinary 不平常的
Instead of tube time, try something new and out of the ordinary with the people in your life.
除了把时间用来看电视，试着去和朋友们做一些新的不同平常的事情。
4.Over the course of 在...期间
I’ve done that over the course of four years in high school.
我已经在高中的时候重复这一过程长达四年的时间了。
