双螺旋线

double spiral的用法和样例：

例句

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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