1. Important derivatives are: corridor, courier, course, current, cursive, cursor, concur, discourse, excursion, incur, intercourse, occur, recur, car, career, cargo, carry, charge, carpenter
重要派生词为： corridor， courier， course， current， cursive， cursor， concur， discourse， excursion， incur， intercourse， occur， recur， car， career， cargo， carry， charge， carpenter

2. To run.
跑，闲逛，流，滑，承载，运送，交往，求助于.

3. Zero-grade form *k^—s- .
零级形式*k^—s- .

4. corral , corrida , corridor , ( corsair ), courante , courier , course , current , cursive , cursor , curule ; concourse , concur , decurrent , discourse , excursion , ( hussar ), incur , intercourse , occur , percurrent , precursor , recourse , recur , succor , from Latin currere , to run.
corral , corrida , corridor , ( corsair ), courante , courier , course , current , cursive , cursor , curule ; concourse , concur , decurrent , discourse , excursion , ( hussar ), incur , intercourse , occur , percurrent , precursor , recourse , recur , succor , 源自 拉丁语 currere , 跑，闲逛，交往.

5. Suffixed form *k^—s-o- .
添加后缀的形式*k^—s-o- .

6. car , career , cargo , caricature , cariole , ( cark ), caroche , ( carry ), charge , chariot ; ( discharge ), from Latin carrus , a two-wheeled wagon;
car , career , cargo , caricature , cariole , ( cark ), caroche , ( carry ), charge , chariot ; ( discharge ), 源自 拉丁语 carrus , 双轮马车;

7. carpenter , from Latin carpentum , a two-wheeled carriage. Both a and b from Gaulish carros , a wagon, cart.
carpenter , 源自 拉丁语 carpentum ,双轮马车. a 和 b 都源自 高卢语 carros , 四轮马车, 二轮运货马车.

kers的词源：

8. Pokorny 2. ^?ers- 583.
波科尔尼2. ^?ers- 583.