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(单词翻译:双击或拖选)
It is a pity that every summer
a few people drown at the beach.
In some cases,
these people were good swimmers.
So how did it happen? Riptide!
Riptide is a strong underwater current.
It moves quickly away
from shore and out to sea.
It appears suddenly and pulls its victim
under and far off shore.
Therefore, people should make it a rule
never to swim too far out from the beach.
很遗憾，每年夏天总有一些人在海边溺水身亡，
而这些溺水的人中有些是很会游泳的。
那么这究竟是怎么发生的呢?
是激流在作祟！
激流是海面下一种强大的暗流，
从海岸迅速地流向大海。
它出现的时候毫无预警，
会将受害者拉下水面并拖离岸边。
因此，人们应该养成
不要游得离海滩边太远的习惯。
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