Polyacetaldehyde
聚乙醛
🗣️ 情景例句
I'll go upstairs and stay with him until he falls asleep again.
我上楼去陪他， 直到他又睡着。
Congratulations on your vitory.
我恭喜你胜利了。
And anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bed was flat.
凡是稍稍想过大海海底的人大概都会认为海底是平坦的。