Now, the decision tree, if I branch left, it's a binary tree.

现在，这个决策树，如果我走左边的分支，这是一棵二叉树。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, they developed this bifurcated tool, which would be appl--you'd put the stuff on the surface of the tool and then you'd scratch the skin in a certain way so that you could produce sort of a reproducible introduction of the vaccine into the skin.

所以他们发明了一种分为两叉的工具,把疫苗抹在这种工具表面上,然后以某种方式在皮肤上刮,这样就能将疫苗,重复不断地引入到皮下

耶鲁公开课 - 生物医学工程探索课程节选

What's shown here is what's called a replication fork in DNA that's undergoing synthesis.

这里展示的是在DNA合成过程中,形成的DNA复制叉

耶鲁公开课 - 生物医学工程探索课程节选