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
I'll wait for my father.
我要等我爸爸。
A bird may be known by its song.
什么鸟唱什么歌。
Then they slowly moved it farther and farther away.
然后，他们慢慢地把它移得越来越远。