Language Point 10
How they do it is a mystery but they must come from somewhere. (Para. 2)
Meaning: How these ideas came to your mind is a mystery; no one can understand. But they must have come from somewhere, an unknown source.
mystery: something that is not fully understood
Many people have tried to solve the problem but without success; it is a mystery that the girl found the solution to it in just a minute.
許多人設法解決這個問題,但都沒有成功; 這個女孩僅在幾分鐘內就把它解決了,真是件怪事。