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
You're working pretty hard these days.
你这阵子工作得很辛苦呀。
Everything will be fine.
一切都会很好。
That was quick! she said. Have you finished already?
“你真快！”她说，“你已经买完东西了吗？”