Mysterious 是一个形容词，意思是“神秘的”、“难以理解的”。以下是一些用“mysterious”造的句子：
1. The disappearance of the plane remains a mysterious event.
2. The ancient ruins hold many mysterious secrets.
3. There's something mysterious about that old house.
4. Her eyes held a mysterious expression.
5. The mysterious stranger disappeared as suddenly as he appeared.
There is nothing mysterious about this negative sign .
