视频对话：
How long are we talking?
有多长时间？
I was a geology major and I did a lot field study work. Oxygen depleted water is most likely from an aquifer.
我以前是学地质学的，做过很多野外调查。乏氧水多半来自含水土层。
本期学习词汇：
geology
n.地质学；（某地区的）地质情况；地质学的著作
例句：
1. He was visiting professor of geology at the University of Jordan.
他是约旦大学的地质学客座教授。
2. His contribution in the field of geology was unparalleled.
他在地质学方面的贡献是无与伦比的。
3. The geology of the area makes it unlikely that such new leaks would be created, but it is still a risk to be avoided.
该地区的地质条件决定了不太可能出现这种新漏点，但这依然是一个需要规避的风险。