Naturally occurring DNA forms a linear chain, like a long piece of twine, so that all one can envision making from it is lines or circles, perhaps snarled up or knotted in one way or another.

• 自然形成的DNA是线形链，像一条长长的合股线，所以这种构造大概只能得出线形或圆形，也许以某种纠缠或打结的方式呈现。