1.
1. 存在性：因此数学家除了研究如 何解题外,还须研究某些存在性(Existence)和唯一性(Uniqueness)的问题. 对于这些问题,有时会得出否定 性的结论,例如五次或以上多项式方程是否存在一般的根式解的问题以及古希腊三大作图题(注9)等,
1. 存在;实有
The existence of something is the fact that it is present in the world as a real thing.
e.g. ...the existence of other galaxies...
其他星系的存在
e.g. The Congress of People's Deputies in effect voted itself out of existence...
(苏联)人民代表大会的投票在事实上终结了自身的存在。
2. （尤指逆境中的）生活，生活方式
You can refer to someone's way of life as an existence, especially when they live under difficult conditions.
e.g. You may be stuck with a miserable existence for the rest of your life...
你可能一辈子都要过着悲惨的生活。
e.g. Their day-to-day existence was routine.
他们的日常生活很平淡。
词典解释
1. 存在;实有
The existence of something is the fact that it is present in the world as a real thing.
e.g. ...the existence of other galaxies...
其他星系的存在
e.g. The Congress of People's Deputies in effect voted itself out of existence...
(苏联)人民代表大会的投票在事实上终结了自身的存在。
2. （尤指逆境中的）生活，生活方式
You can refer to someone's way of life as an existence, especially when they live under difficult conditions.
e.g. You may be stuck with a miserable existence for the rest of your life...
你可能一辈子都要过着悲惨的生活。
e.g. Their day-to-day existence was routine.
他们的日常生活很平淡。