Dihydroxy tribasic acid
[化] 二羟三价酸; 二羟三碱价酸
🧩 词语组成解析
a. 三碱(价)的\\n[化] 三碱的; 三碱价的; 三元的; 三取代的
🗣️ 情景例句
autograph copies for the guests at the opening?
在展览开幕时为客人在书上亲笔签名呢
When three know it, all know it.
三人知，天下晓。
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，