Sorbaldehyde
山梨醛, 已二烯
🗣️ 情景例句
How about tomorrow?
明天怎么样？
It's about time!
正是时候。
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
大家都知道，在墙壁或山腰附近发出的喊声，就会听到回声。