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left-handed helix
el. 左旋线
genet. 左手螺旋
mol.gen. 左旋螺旋
tech. 左向螺旋线
left-hand helix
auto. 左螺旋刀齿
el. 左旋线
tech. 左侧螺旋线; 左向螺旋线

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