1. 今年夏天已有十人游泳
There have been ten swimming fatalities this summer.

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2. 今年夏季已有十人游泳
There have been ten swimming fatalities this summer.

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3. 在沙滩上漫步时,他看见一个男童遇溺
Walking along the beach, he saw a boy drowning.

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4. 在沙滩上漫步时,一个男童被看见正在遇溺
Walking along the beach, a boy was seen drowning.

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5. 在沙滩上漫步时,一个男童被看见正在遇溺
Walking along the beach, a boy was seen drowning.

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