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
Please. That sounds good.
听起来不错，请给我弄一杯。
The morning to the mountain the evening to the fountain.
凡是都有一定时间。
Ducks know how to swim when they are born.
鸭子天生会游泳