Lactonic ring
[机] 内酯环
🧩 词语组成解析
a. [化]内酯酸的, 无水氢氧酸类的
ring
[riŋ]
n. 戒指，指环;铃声，钟声;环形物;拳击场;
vt. 形成环状;环绕;使（例如铃）响;打电话给;
vi. 按铃，敲钟;回响;成环形;
🗣️ 情景例句
I won't permit you to buy a crossbow, now or ever.
我不会允许你买弓弩的，永远也不会。
A thousand friends are few, one enemy is too many.
朋友千人尚觉少，仇敌一人犹嫌多。
He was on his way to a lecture, when a tourist stopped him and asked him for directions.
他走在去听课的路上，此时一位游客拦住他问路。