Efc
abbr. earth fixed coordinate 固定坐標系; electronic feedback carburetor 電子反饋汽化器; engineered for color 彩色（電視機）工程; Evergreen Fir Corporation (initials) 常青樅樹公司（組織名稱的第一個字母）
??? 情景例句
have been busy at work this morning
一早上都在忙著
Please try and answer the request soon.
請試著立刻回答人家的請求。
I haven't forgotten anything, she said to herself. But then it was time to pay for them.
“我什么也沒忘記，”她自言自語地說。但接著該是她付錢的時候了。