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.
很遺憾，每年夏天總有一些人在海邊溺水身亡，
而這些溺水的人中有些是很會游泳的。
那么這究竟是怎么發(fā)生的呢?
是激流在作祟！
激流是海面下一種強(qiáng)大的暗流，
從海岸迅速地流向大海。
它出現(xiàn)的時候毫無預(yù)警，
會將受害者拉下水面并拖離岸邊。
因此，人們應(yīng)該養(yǎng)成
不要游得離海灘邊太遠(yuǎn)的習(xí)慣。
(紅色部分不被強(qiáng)調(diào))

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