Ordinalism
序数论
🗣️ 情景例句
You are twenty-one, a grown-up young lady old enough to make up your own mind.
你已经21岁了，已经到了可以自己做主的年龄了。
No problem. How much?
没问题，你要多少？
The aeroplane is flying over the river.
飞机正从河上飞过。