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
We're a family, Harry.
我们是一家人， Harry。
How long will you be away?
你将离开多久？
In this part of the cave, they could hear an insistent booming sound which they found was caused by a small waterspout shooting down into a pool from the roof of the cave.
在这儿，他们可以听见一种连续不断的轰鸣声。后来他们发现这是由山洞顶部的一个小孔里喷出的水柱跌落到水潭中发出的声音。