s. having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
a. 神秘的, 难解的, 不可思议的
1. The old house at the end of the street is very mysterious.
街道尽头的老房子非常神秘。
2. She received a mysterious letter with no return address.
她收到了一封没有寄件人地址的神秘信件。
3. The scientist is studying a mysterious phenomenon in the ocean.
这位科学家正在研究海洋中的一种神秘现象。