Metaformaldehyde
[化]变甲醛, 聚甲醛
🗣️ 情景例句
How much do you need?
你需要多少钱？
It's no use pumping a dry well.
徒劳无益。
An earthquake comes like a thief in the night, without warning.
地震就像夜间的小偷，不打招呼就来了。