单词clocker
n.: 倒拨里程表的人；里程表作弊者；（可卡因等的）毒品贩子
网络: 计时员；计时器；计速员
倒拨里程表的人；里程表作弊者:
a person who illegally changes a car"s milometer so that the car seems to have travelled fewer miles than it really has
（可卡因等的）毒品贩子:
a person who sells illegal drugs, especially cocaine or crack
计时员