unknown是什么意思

The scientist confirmed the snake was a previously unknown species after conducting a genetic analysis of tissue samples.

出自-2017年6月听力原文

According to Leslie, those who ridiculed former Defense Secretary Donald Rumsfeld for his 2002 remark that we have to be wary of the unknown unknowns were mistaken.

2017年12月四级真题（第二套）阅读 Section B

What distinguishes a depression from a harsh recession is paralyzing fear - fear of the unknown so great that it causes consumers, businesses, and investors to retreat and panic.

出自-2013年6月阅读原文

These "thought experiments" were pages of calculations signed and submitted to the prestigious journal Annalen der Physik by a virtual unknown.

出自-2010年12月阅读原文

Into the Unknown The world has never seen population ageing before

出自-2010年12月阅读原文

Andrew Miller thinks social media needs more attention than banks mainly because it remains unknown how users' data will be taken advantage of.

2016年高考英语上海卷 阅读理解 阅读C 题设

But how they're doing it is still unknown.

2015年高考英语北京卷 阅读理解 阅读C 原文

Granddaughter Gayle Parks, 31—who works alongside her in the family business—said it remained unknown as to who nominated Irene for the award.

2019年高考英语全国卷2 语法填空 原文

I could only have left it on the G9 bus, which was now speeding in the dark to some unknown station.

2019年高考英语天津卷 完形填空 原文

I guess that there's probably some demanding work schedule, or social anxiety around stepping up to help for an unknown sport.

2019年高考英语全国卷2 阅读理解 阅读B 原文

In theory, they should live by the French law is often ignored or unknown, thus making them into an interesting area of "lawlessness" in the world.

2016年高考英语四川卷 阅读理解 阅读C 原文

Stress used to be an almost unknown word, but now that we are used to talking about it, I have found that people are beginning to get stressed about being stressed.

2016年高考英语上海卷 语法填空 B 原文

The music allowed me to learn that teaching is about sharing and respect, tears and smiles, the knowing and the unknown and, most of all, an understanding of each other.

2015年高考英语湖南卷 完形填空 原文

When most of us get a text message on our cell phone from an unknown person, we usually say "Sorry?"

2018年高考英语全国卷3 完形填空 原文

Yet only one of his books is now in print, and his vast body of writings on music is unknown save to specialists.

出自-2010年考研阅读原文