Efc
abbr. earth fixed coordinate 固定坐标系; electronic feedback carburetor 电子反馈汽化器; engineered for color 彩色（电视机）工程; Evergreen Fir Corporation (initials) 常青枞树公司（组织名称的第一个字母）
🗣️ 情景例句
but, unfortunately,
但是， 很不幸，
It is easy to open a shop but hard to keep it always open.
开设店铺易，维持常开难。
After a few minutes she started to cry again. Listen to me, I said.
几分钟后她又哭了起来。“听我的呀，”我说。