Hemiformal
半缩甲醛
🗣️ 情景例句
It's nice seeing you.
非常高兴见到你。
Water dropping day by day wears the hardest rock away.
水滴天天滴不停，石头最坚也磨损。
The fire service began to wonder whether a gas might have caused the fire.
消防部门开始怀疑有一种气体可能会导致火灾。