"The mother of one of my best friends had also died of abrain tumor," says David.

“我最好的一位朋友的妈妈也是死于脑癌。”大卫说。

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"The mother of one of my best friends had also died of abrain tumor," says David.

“我最好的一位朋友的妈妈也是死于脑癌。”大卫说。

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