Olefination
烯化作用, 成烯作用
🗣️ 情景例句
but if Boswell wins
但是假如Boswell赢了？
Which one is cheaper?
哪一个是较便宜的？
While we were having breakfast, our little boy, Tommy, found two small coins on the floor.
正当我们吃早饭时，我们的小男孩汤米在地上找到两枚小硬币。