視頻對話：
How long are we talking?
有多長時間？
I was a geology major and I did a lot field study work. Oxygen depleted water is most likely from an aquifer.
我以前是學地質學的，做過很多野外調查。乏氧水多半來自含水土層。
本期學習詞匯：
geology
n.地質學；（某地區的）地質情況；地質學的著作
例句：
1. He was visiting professor of geology at the University of Jordan.
他是約旦大學的地質學客座教授。
2. His contribution in the field of geology was unparalleled.
他在地質學方面的貢獻是無與倫比的。
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.
該地區的地質條件決定了不太可能出現這種新漏點，但這依然是一個需要規避的風險。