Lactonic ring
[機] 內酯環
?? 詞語組成解析
a. [化]內酯酸的, 無水氫氧酸類的
ring
[ri?]
n. 戒指，指環;鈴聲，鐘聲;環形物;拳擊場;
vt. 形成環狀;環繞;使（例如鈴）響;打電話給;
vi. 按鈴，敲鐘;回響;成環形;
??? 情景例句
I could pay you back out of my lifeguard salary.
我可以從我當救生員的薪水中拿出來還你。
I plan to be here for over a year.
我計劃在這里住一年以上。
Looking up I saw that we were surrounded by children in rags who were looking at us silently as we ate.
我抬頭一看，發現我們被一群衣衫襤褸的小孩團團圍住了，他們在默不作聲地看著我們吃飯。