然而，到了20世纪80年代，巴克的论点开始受到质疑，因为许多科学家在各种恐龙的骨骼中发现了与现代爬行动物相似的生长环。

In the 1980's, however, Bakker's contention began to be questioned, as a number of scientists found growth rings in the bones of various dinosaurs that are much like those in modern reptiles.

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一位科学家想知道树是如何生长的。

A scientist wondered how a tree grows.

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科学家做了一个测试，发现树木可以生长，是因为水和空气中的气体。

The scientist did a test and found that trees can grow because of water and a gas from the air.

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Here is a thin membrane, it's a polymer scaffold, and on that polymer scaffold scientists have placed some skin cells and they've allowed it to grow.

这是一张薄膜,它是一个聚合物支架,在这个支架上,科学家放了一些皮肤细胞,并让它们生长

耶鲁公开课 - 生物医学工程探索课程节选