The opposite would be anti - existence, as the opposite of matter is antimatter.存在的对立面应该是 反 存在, 正如物质的对立面是反物质一样.Antimatter has been produced experimentally, but little of it is found in nature.反物质已在实验室中产生, 但还未在自然界中找到.I to...

n.反物质...

antimatter的音标：antimatter的英式发音音标为：['æntimætə(r)]antimatter的美式发音音标为：['æntɪˌmætɚ, 'æntaɪ-]...