Definition
Used to express uncertainty or to emphasize a statement; some may find its use offensive.
（用於表示不知情或加強語氣）天知道（有些人認為這種說法帶有冒犯意味）。
Goodness knows why he would do that!
天知道他為什麼會那樣做！
Heaven knows how long she'll stay there.
天知道她會在那裡待多久。
I have no idea where he is right now, God knows.
我完全不知道他現在在哪裡，天知道。