mysterious events or situations are difficult to explain or understand

神秘的，难以解释（理解）的:

The police are investigating the mysterious deaths of children at the hospital.

警察正在调查医院里儿童神秘死亡的原因。

Benson later disappeared in mysterious circumstances .

本森后来就神秘地失踪了。

There's something mysterious going on.

出了件怪事。

a mysterious person is someone who you know very little about and who seems strange or interesting

〔人〕神秘的;

I decided to find out more about my mysterious new neighbour.

我下决心要多了解一下我那神秘的新邻居。

a mysterious stranger

神秘的陌生人

someone who behaves in a mysterious way says very little about what they are doing, in a way that makes you want to know more

〔行为〕神秘的，诡秘的;

Helen's being very mysterious about her plans.

海伦把她的计划弄得很神秘。

She hid her thoughts behind a mysterious smile.

她神秘地一笑，掩饰了自己的想法。

Jackson had mysteriously disappeared.

杰克逊神秘失踪了。