Substitutions
n. 代替；代用；替换（substitution的复数）
🗣️ 情景例句
Dinner's on me.
晚饭我请客。
Can you guess what I was doing this morning?
你能猜到今天上午我在做什么吗？
Li Bai is one of the greatest poets that have ever lived in China.
李白是中国有史以来最伟大的诗人之一。