单词：double helix
double helix的用法和样例：
例句
- That is what a double helix looks like.这就是二重螺旋线的形状。
- Each step of the double helix is a base made up of two kinds of nucleic acid.每阶二重螺旋线都是一个碱基，由两种核酸组成。
- It provided strong evidence of the structure of D-N-A as a double helix.它为脱氧核糖核酸结构呈双螺旋线提供了有力证据。
- Many of the databases along the double helix were shut down, closed, so that you began to function with very little data.许多数据库是顺着双螺旋线停止运行，关闭，让你们开始运行很少的数据。
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