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
Maybe we should do it again.
也许我们该再来一次。
I'd met Stone several times before.
以前我见过世通几次。
The winning car reached a speed of forty miles an hour -- much faster than any of its rivals.
获胜的那辆车达到了时速40英里--远远超过任何对手。