Normal, double-helix DNA is spiral , like a loosely coiled spring.

正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。

youdao

Normal, double-helix DNA is spiral , like a loosely coiled spring.

正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。

youdao