true zero

例句：

1. 1. The true zero of the universe is still being discovered.
   宇宙的真实零点仍在被发现。
2. 2.The true zero of time is a concept that has puzzled scientists for centuries.
   时间的真实零点是一个困扰科学家几个世纪的概念。
3. 3.In mathematics, the true zero is used to represent an infinitely small number.
   在数学中，真零用来表示一个无限小的数。