Dem. is the written short form of Democrat or Democratic, almost always in United States politics.

in United States politics在美國政治裡 Dem.Dem. is almost always幾乎都是 the written short form of Democrat or Democratic Democrat或Democratic的書面縮寫

A Democrat is a person in the Democratic Party; Democratic names the party or its ideas (a Democratic senator, the Democratic bill).

A Democrat Democrat is a person in the Democratic Party指民主黨裡的人；Democratic Democratic names the party or its ideas則是指這個政黨或其理念（a Democratic senator民主黨籍參議員、the Democratic bill民主黨提出的法案）

You see Dem. in newspapers, lists, and captions where space is tight: “Jane Lee (Dem., Ohio).” It is not a short form of democracy as a system, and it is not short for demonstration (a protest) or for the other English word demo.

You see Dem.你會看到Dem. in newspapers, lists, and captions出現在報紙、名單和圖說裡 where space is tight空間有限的時候，就像"Jane Lee (Dem., Ohio)."這樣。It is not a short form of democracy as a system它不是democracy（民主制度）的縮寫，and it is not short for demonstration (a protest)也不是demonstration（抗議活動）的縮寫，or for the other English word demo或另一個字demo的縮寫

In speech people usually say Democrat or Democratic in full; the little form lives on the page.

In speech在口語裡 people usually say Democrat or Democratic in full人們通常會把Democrat或Democratic完整說出來；the little form這個小縮寫 lives on the page只活在書面上

The matching short form for the other big US party is Rep. (Republican).

for the other big US party美國另一個大黨 the matching short form對應的縮寫 is是 Rep.Rep.（Republican共和黨）