For hygienic reasons, restaurants should wash silverware and drinking glasses more than once.出于卫生原因,餐馆清洗银制餐具和玻璃杯应不少于两遍。Requirements for the position include a master's degree and at least five years of work experience.这个职位要求具备硕士学历和不少于五年的工作经验。No self-respecting oil tycoon has fewer than two helicopters.真正的石油大亨都有不少于两架直升机。