这就是为什么重量训练的一个重要组成部分的重量损失方程。
That's why weight training is an important part of the weight loss equation.
蝶阀结构简单、体积小、重量轻，只由少数几个零件组成。
Butterfly simple structure, small size, light weight, only by a small number of parts.
蝶阀结构简单、体积小、重量轻，只由少数几个零件组成。
Butterfly simple structure, small size, light weight, only by a few parts.
蝶阀结构简单、体积小、重量轻，只由少数几个零件组成。
Butterfly simple structure, small size, light weight, only by a few parts.
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