Definition
Used to express confusion, disbelief, or exasperation about something, often implying the speaker finds it difficult to understand or accept.
（用於加強批評、驚訝等語氣）真不知道
I don't know how you can fall asleep with all this noise.
我不知道你怎麼能在這麼吵的情況下睡著。
I don't know why they chose that company; they have no experience whatsoever.
我不知道他們為什麼選擇那家公司；他們根本沒有經驗。
I don't know why she would say that to me; I’ve never done anything to her.
我不知道她為什麼會對我說那種話；我從未對她做過什麼。