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这句话的意思是 "because he can exercise his body"."exercise" 是英语中常用的锻炼身体的词汇，来自拉丁语 "exercitare"，意为锻炼、训练。
举几个例句：
I exercise every morning to stay in shape. (我每天早上都锻炼身体保持身材。)
He exercises regularly to improve his health. (他经常锻炼来提高健康水平。)
She enjoys exercising outdoors. (她喜欢户外锻炼。)
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