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
Not really.
不是吧。
It is better to wear out than to rust out.
与其锈掉，不如用坏。
I have the right to know.
我有权知道。