sharks have been around for a very long time.这句话中为什么有around?

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sharks have been around for a very long time.这句话中为什么有around?
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sharks have been around for a very long time.这句话中为什么有around?
sharks have been around for a very long time.这句话中为什么有around?

sharks have been around for a very long time.这句话中为什么有around?
be around是个习惯用语
be around [简明英汉词典]
来(访)

鲨鱼在世界上存在了很长时间了

have been around 是习语。。。相当于 have existed
Poetry has been around for centuries.

如果没有around,那这就不是一个句子了啊...缺成分
你见过 i am for a long time的句子吗?
鲨鱼在周围绕了很久

鲨鱼在附近徘徊了很长时间。
这样可以理解around的意思了吧
你还可以理解为在周围
有语境的话更好理解了

是“在世界上存在了很长时间”的意思,这要有生物知识作辅助就一目了然了,鲨鱼是一种在生物界令人惊叹的经久不衰的动物,就是平常说的“活化石”