名词
中文翻译：左手螺旋
同义词：
['left-handed helix', 'left-handed spiral']
例句：
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1. The left hand helix is acommon feature of many musical instruments.
左手螺旋是许多乐器的常见特征。
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2. The lefthand helix is responsible for the pitchand rhythm of music.
左手螺旋负责音乐的音高和节奏。
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3. Theleft hand helix isan important part of the instrument's design.
左手螺旋是乐器设计的重要部分。