n.存在；生存
The newspaper ceased to appear after an existence of three months. 该报发行3 个月后停刊了。
According to some philosopher, everything in existence is reasonable. 某位哲学家认为，存在的事物都是合理的。
Pollution poses a threat to the continued existence of this species. 污染对这一物种的继续生存造成了威胁。
n.不存在的事；无；不存在的东西
n.共存；共处
