The unicorn is a mythical creature that doesn't exist in reality.
独角兽是一种现实中不存在的神话生物。
The concept of a perpetual motion machine is
non-existent in the laws of physics.
永动机的概念在物理学定律中是不存在的。
In the desert, water sources can be
non-existent for miles around.
在沙漠中，方圆几英里内可能找不到水源。
The idea that humans can live without sleep is purely
non-existent.
人类可以不睡觉生活的想法纯粹是不存在的。
Aliens have not been proven to exist, so they are considered
non-existent by many scientists.
外星人尚未被证实存在，因此许多科学家认为它们不存在。
The ancient city described in the legend has never been found, it's
non-existent in the modern world.
传说中的古城从未被发现，它在现代社会中不存在。
A square circle is a mathematical entity that is
non-existent.
正方形的圆是一个不存在的数学实体。
The notion of time travel to the past is still in the realm of science fiction, hence,
non-existent in reality.
回到过去的时间旅行在现实中是不存在的，目前仍属于科幻范畴。
The memory of my childhood friend has become
non-existent after so many years.
经过这么多年，我童年朋友的记忆已经消失了。
The concept of zero gravity on Earth's surface is
non-existent; there's always some gravitational force acting on objects.
地球表面的零重力概念是不存在的；总是有一些重力作用在物体上。
Facilities for breastfeeding and diaper-changing in public areas have long been almost non-existent in the world's most populous country.
"It was a practically non-existent city 40 years ago, one of the poorest places in Guangdong province, and today it is the most important city, eclipsing the Hong Kong Special Administrative Region and other cities in China, like Shanghai," he said.
Before 2017, rooftop solar was almost non-existent, with only 4 GW of installed capacity in 2016.
In fact, they use advanced technologies in Chinese air conditioners that are non-existent elsewhere," Abul-Huda said.
Tariffs, which are non-existent for goods that move from one EU nation to another, are an oversized threat to British carmakers because they could be applied each time those components cross and re-cross international borders on their way to the new car showroom.