Upper carboniferous
un. 上石炭统\\n
🧩 词语组成解析
upper
['ʌpə]
adj. 地位较高的;上面的;内地的;地表层的;
n. 鞋帮，靴面;兴奋剂;令人兴奋的经历;
n. 石炭纪, 石炭层\\na. 含碳或煤的
🗣️ 情景例句
He has a large family to feed.
他要养活一个大家庭。
What is happening over there?
那里发生什么事情？
How did you find the talk this morning?
你觉得今天早晨的报告怎么样？