Fish was a major source of protein for the working man.

鱼曾是劳动者获取蛋白质的主要来源。

《柯林斯英汉双解大词典》

Fish was a major source of the protein for the physical working man.

对于体力工作者，鱼是主要的蛋白质来源。

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Fish was a major source of the protein for the physical working man.

对于体力工作者，鱼是主要的蛋白质来源。

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