They're derived from a precursor called triacylglyceride, which is as glycerol molecule with three fatty acid chains dangling off of it.

它们来源于一种叫三酰甘油的前体,由甘油分子上连接了,三个脂肪酸链构成

耶鲁公开课 - 生物医学工程探索课程节选

If someone was telling you this story, is that the first question you would ask? So did she have a precursor? No, probably not. Okay.

如果有人告诉你们这个故事，这会是你们,问的第一个问题吗，可能不是，好的。

耶鲁公开课 - 1945年后的美国小说课程节选

I mean it wasn't terrible, it was sort of a precursor to what people are trying to do It flopped miserably, but I'm glad we did it.

其实也没那么糟糕，它就是个先兆，预示了现今人们,很悲惨它失败了，不过我很高兴我们做过。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

We talked about the artificial hip which is a modern precursor of the splint I talked about before.

我们之前说到的人造髋关节,就是由固定腿部的夹板衍生而来

耶鲁公开课 - 生物医学工程探索课程节选

So, she had a precursor. So what? Does that make any difference?

所以，在她之前有过别人，那有怎样，会造成不同吗？

耶鲁公开课 - 1945年后的美国小说课程节选

This is another thing to notice. He's not just making us experience Lolita's name the way he does; he's assuming that there are certain kinds of questions that we will ask. "Did she have a precursor?"

这也值得注意，他不仅让我们体会,他感知到的Lolita的名字，他想象出了,我们可能会提出的问题，在她之前还有别人吗“

耶鲁公开课 - 1945年后的美国小说课程节选