Etf
abbr. 交易型开放式指数基金（Exchange Traded Fund）；发动机试验设备（Engine Test Facilities）
🗣️ 情景例句
We were all sorry when we heard that your brother had had an accident.
我对你弟弟的意外感到遗憾。
An empty bag cannot stand upright.
空袋不能直立。
The cooker is blue.
电灶的颜色是蓝的。