来自《耶鲁大学开放课程：生物医学工程探索 第1集 第1集》
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but wasn't even on the charts in 1665?却甚至没有在一六六五年的名单中出现 -
So it could be that - what's your name?可能真是这样的 你叫什么名字 -
Justin贾斯汀 -
So Justin said it could be贾斯汀认为我们周围的环境 -
new things that are around出现了很多新物质 -
and you're exposed to stuff we weren't exposed to before并且人们暴露在前所未有的环境中 -
and that's true.这是事实 -
Our environment has changed,我们生活的环境已经改变 -
the world has become industrialized.全球普遍工业化 -
We're exposed to things that might cause cancer我们暴露于可能致癌的物质中 -
where weren't exposed to这些物质在以前是没有的 -
them before and so that might be a reason.这可能就是原因之一