Kerogen
n. 油母岩\\n[化] 油母质
🗣️ 情景例句
I fell out of the boat!
我摔到船外去了。
I'd like to make an overseas call to Taibei, Taiwan by collect call.
我要打对方付费的电话到台湾的台北。
and is still non-existent in a number of 'civilized' nations.
今天，在许多文明国家里，义务教育迄今尚未实行。