Unknowns
n. 未知事件（unknown的复数）
🗣️ 情景例句
It's extremely good of you to do this for me.
你帮我做了这件事，真是太好了。
They had to call in a heart specialist.
他不得不请一位心脏病专家。
He could make out three men in a basket under it and one of them was holding a pair of binoculars.
他看清了气球下面有3个人呆在一只筐里，其中一个举着望远镜。