Higher mathematics
[计] 高等数学
🧩 词语组成解析
[经] 上扬
🗣️ 情景例句
Take care, and don't be a stranger.
保重，以后别见外。
The moon emerged from behind a cloud.
月亮从云后出现。
He has an old head on young shoulders.
他年轻又有见识。