1. In English, "pre-era" is traditionally represented by "BC" and is an acronym for "before Christ".

2. British Columbia (English: British Columbia, abbreviated as B.C；; French: Colombie-Britannique (abbreviated as C.B.), or British Columbia, is a first-class administrative region of Canada, located in the westernmost province of the country, bordering the Pacific Ocean in the west.

3.bc, the abbreviation of bench calculator, is a calculator language with arbitrary precision, and its grammar is similar to C language.

4. Battleship (English: Battleship or Combat Cruiser; Abbreviation: BC) is the main ship that was active for a short time in the early 20th century.

5. British Council (English: British Council; Abbreviation: bc), a non-profit organization established by the British government on 1934, is committed to promoting the expansion and exchange of British culture, education and international relations, and has branches in more than 200 cities in 109 countries around the world.

6. Black carbon (black carbon; Abbreviation: BC) is a kind of suspended particulate matter, which comes from the products of incomplete combustion and oxidation of carbonaceous materials (mainly oil, coal, charcoal, trees, firewood, plastic waste, animal manure, etc.). ).