DNA（脱氧核糖核酸）的分子是一种双螺旋结构，酷似一架沿纵向扭曲的梯子。
The DNA molecule is a double helix, resembling a ladder that's been twisted along its length.
首先，我们研究了超声分子束的纵向平动温度和中心速度与束源温度的关系；
First, we study the relation between the translational temperature of the molecular beam and the temperature of the beam source chamber;
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