Hydroxylammonium
羟铵
🗣️ 情景例句
When the bough breaks,
树枝若折断
When the lights went out, I was washing my hair.
当熄灯的时候，我在洗头。
Up to now, historians have assumed that calendars came into being with the advent of agriculture, for then man was faced with a real need to understand something about the seasons.
历史学家迄今认为日历是随农业的问世而出现的，因为当时人们面临着了解四季的实际需要，