動詞 exist:

1. have an existence, be extant
   同義詞：be
2. support oneself
   同義詞：survive, live, subsist

1. That department has ceased to exist.
   那部門已不復(fù)存在。
2. I can hardly exist on the wage I'm getting; there is no money for luxuries.
   我靠我掙的工資簡直難以　口，根本無錢享受。
3. Man cannot exist without air.
   沒有空氣人就不能生存。
4. The Roman Empire existed for several centuries.
   羅馬帝國存在了幾百年。

ex.ist

v.intr.（不及物動詞）
ex.ist.ed,ex.ist.ing,ex.ists
To have actual being; be real.
實際存在；真實
To have life; live.See Synonyms at be
有生命；生存參見 be
To live at a minimal level; subsist:
維生： 生活在極低的水平；維持生活：
例句：
barely enough income on which to exist.
僅夠糊口的收入

To continue to be; persist:
繼續(xù)存在；保持存在：
例句：
old customs that still exist in rural areas.
在農(nóng)村地區(qū)舊的風(fēng)俗依然存在

To be present under certain circumstances or in a specified place; occur:
存在：在一定情狀或一定地點存在；存在：
例句：
.Wealth and poverty exist in every demographic category.(Thomas G. Exter)
.富裕和貧窮存在于所有人口統(tǒng)計分類中.(托馬斯G.埃克斯特)

來源：
Latin existere, exsistere [to come forth, be manifest]
拉丁語 existere, exsistere [顯出，明顯]
ex- [ex-]
ex- [前綴，表.出自….]
sistere [to stand] * see st3-
sistere [位于] *參見 st3-