First-day cover
n. 首日封
📖 牛津释义
first-day cover
envelope with a set of special stamps postmarked on the first day of issue 首日封.
🧩 词语组成解析
first
[fɝst]
n. 第一，最初;头等;一号，;[乐]高音部;
adv. 最早，最初;首次;宁愿;优先;
adj. 第一流的;最初的，最早的;基本的，概要的;高音的;
num. 第一;
day
[de]
n. 一天;白天;时期;节日;
adj. 日间的;逐日的;
adv. 每天;经常在白天地;
🗣️ 情景例句
My watch stopped.
我的表停了。
Friendship is love with understanding.
友谊是爱加上谅解。
Marine Studio biologists have pointed out that, however intelligent they may be, it is probably a mistake to credit dolphins with any motive of lifesaving.
海洋摄影室的生物学家指出，无论海豚多么聪明，认为它们有救人的动机可能是错误的。