We had the best choir in the area and there were also several rock strata visible on the walls which made teaching geology far more interesting.
洞壁上可以看到好几种岩层，用这个教地理生动有趣。 而且我们不需要生物课本，我们的山洞学校里每天都能看到蝙蝠、蜥蜴。
There exist four layers of volcanic rocks in Sinian and Cambrian strata of Kuruktag area, Xinjiang.
在新疆库鲁克塔格地区的震旦纪和寒武纪沉积岩地层中，分布有四层火山岩。
Paleogravel bed around Nanjing city is one of primary Cenozoic strata in Nanjing area.
南京附近的古砾石层是该地区新生代重要地层之一。
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