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He does pull - ups exercises to strengthen his muscles.
他天天做引体向上,就是为了练臂力.
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By his mid - 20 s he had mastered doing pull - ups with one arm, or with 140 lb of weights.
当可以熟练地单手引体向上, 或是负重140磅引体向上时,他25岁上下.
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