adj. 双的;两倍的;两面派的;双人用的;
vt. 使加倍;把…对折;重复;
vi. 加倍,加倍努力;快步走;
adv. 两倍地;双重地;
n. 两倍;双精度型;
doub二,双+le反复 → 反复两倍 → 翻倍
🗣️ 情景例句
May I ask how Mr. Mrs- is?
-先生(小姐)好吗?
That work will take three hours.
完成那项工作需要三小时。
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.