Olefination
烯化作用, 成烯作用
🗣️ 情景例句
You've changed a lot since I last saw you.
自从我上次见到你以来，你改变了很多。
Would you please have these clothes washed for me?
可以请你为我把这些衣服洗了？
This machine joins the metal pieces together, he said.
“这台机器把金属片焊接起来，”他说