Having a convenient light source changed people's lives.

便捷的光源改变了人们的生活。

When I double-click a commit, I go to the new commit viewer where I can see the actual source changes.

我双击一个提交记录，就进入新的提交视图，在这里我可以看到真实的代码变化。

You've referred to changing our energy sources, changing how we transport.

你提到改变我们的能源，改变我们的运输方式。

And the 2007 study compared the isotopes in several fossils of Prototaxites from different eras and found that those ratios changed radically over time, probably as its food sources changed.

2007 年的研究比较了不同时代的几种原紫杉类化石中的同位素， 发现这些比例随时间发生了根本性变化，这可能是因为其食物来源发生了变化。