轮换 rotate; take turns; alternate 定期轮换 take turns according to a fixed schedule; 这个车间的工人上白班和上夜班每周轮换一次。 the workers in this workshop do day and night shifts in weekly rotation.; 轮换牧地 rotation pasture; 轮换栽培 alternation of culture; 轮换种植 shifting cultivation
发球 serve a ball; serve; service 发球得分 ace; 发球犯规 fault; 发球失误 missed service; 巧妙的发球 a tricky serve; 接发球 a return of a service; 换发球 change of service; side out; change service! 该你发球。 your serve. 他发球发得好。 he has a very good serve. 该谁发球? whose service is it?; 发球器 service robot; 发球抢攻 attack after service; 发球区 service area