One strand of silk doesn't make a thread; one tree doesn't make a forest.

单丝不成线， 独木不成林。

《新英汉大辞典》

All I need is one strand of hair.

而我只要你的一缕头发。

youdao

You generally use one strand of floss for this.

您通常使用的牙线这一个链。

youdao

So DNA is replicated using one strand of the DNA as a template.

所以DNA复制是以DNA单链为模板的

耶鲁公开课 - 生物医学工程探索课程节选

You then denature again, each one of these strands gets separated, primers bind, turn on the polymerase, a new strand is made.

然后你可以再次使产物链变性,使各链解旋,再结合引物,激活聚合酶,再生成新链

耶鲁公开课 - 生物医学工程探索课程节选

Now, the second great strand in the history of the West is the Judeo Christian tradition, a very different tradition from the one I have just described.

现在,我们谈谈西方历史的第二大主线,犹太基督教传统,一种与之前谈论的截然不同的文化传统

耶鲁公开课 - 古希腊历史简介课程节选

Amazing as it is, this is only one strand of Machover's remarkable work.

CNN: 'Guitar Hero' guru makes music with robots

One strand of these negative financial trends has been elucidated by Morgan Stanley, in what it calls the balkanisation of the eurozone banking system.

BBC: Can Draghi do 'whatever it takes' to save euro?

And the pharmacokinetic research is only one strand of the work the FDA is doing on BPA at its National Center for Toxicological Research in Arkansas and in conjunction with the National Toxicology Program.

FORBES: Leading Environmental Group Scientist Praises FDA's Ground-Breaking Research On BPA: A Tipping Point In The Controversy?