左旋分子就是使偏振光发生左(即逆时针方向)旋的分子。
A left-handed molecule is one that causes polarised light to rotate to the left (ie, anticlockwise).
这类特征中最奇异的一个就是许多构成生命的分子是左旋的。
And one of the most bizarre of these features is that a lot of the molecules of which life is made are left-handed.
构成生命体的许多关键分子都有一个特定的导向，或者说是旋向性：脱氧核糖核酸右旋，氨基酸左旋。
Many of the key molecules for life have a specific direction, or handedness: DNA twists to the right, amino acids to the left.
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