单词：triple helix
triple helix的用法和样例：
例句
- The CD spectra showed that the addition of glycerol to the collagen did not damage the native triple helical structure of collagen.圆二色谱表明，甘油的加入没有改变胶原天然的三股螺旋结构。
- For two complementary strands of nucleotides, the free energy is minimized when they pair up to form a double helix.就两股互补的核苷酸分子而言，配对形成一条双股螺旋时的自由能会最低。
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