Methaldehyde
四聚乙醛
🗣️ 情景例句
Don't worry, be happy.
别担心，开心点。
A person must strain one's ears to hear a wild animal in the forest.
在森林里，人类必须对野兽竖起耳朵才行。
They notice more.
他们观察到的东西更多。