Permians
a. 二叠纪的\\nn. [地质] 二叠纪
🗣️ 情景例句
Work harder and practice more.
要更加努力地学习，更加勤奋地操练。
He's the youngest in the family.
他是一家中最小的。
However, this does not always happen.
然而，情况并不都是这样，