(Brit.)a police officer (英)警察;警官 ■(亦作 police constable)a police officer of the lowest rank 等级最低的警官
the governor of a royal castle (皇家城堡的)总管 ■(historical)the highest-ranking official in a royal household (史)王室总管;宫廷最高长官
语源
Middle English (in sense 2): from Old French conestable, from late Latin comes stabuli 'count (head officer) of the stable'. Sense 1 dates from the mid 19th cent