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
That's my boy!
好儿子！
Each bird likes to hear himself sing.
每一只鸟都爱听自己歌唱。
We're going to meet here, outside the school gate, at two o'clock.
我们打算两点钟在校门外见面。