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。
Green silk enwinds winter butterfly, say, only keep light affection silk.
青丝缠绕着冬季的蝴蝶，欲言又止，只留淡淡情丝。
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.
蝶阀结构简单、体积小、重量轻，只由少数几个零件组成。
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