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
And I'd like to give you a little something to take home. Let me unroll it.
对了，我有样小东西想送你，让我把它打开。
I told him to come in while waiting.
我告诉他进来等一下。
Yes. It sounded like a train that was going under my house.
是的。这响声听起来像是一列火车在从我的房子下面驶过。