One eof the main effects of human activity on an area is water pollution.

人类活动对一个地区的主要影响之一是水污染。

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Diving is the activity of jumping into water with your head and arms first.

跳水运动是在人跳入水中时，头和手臂先入水的运动。

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Diving is the activity of jumping into water with your head and arms first.

跳水运动是在人跳入水中时，头和手臂先入水的运动。

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