Just as all truck drivers and construction workers are no longer necessarily men, all secretaries and receptionists are no longer automatically women.正如卡车司机和建筑工人不必要都是男性一样,所有的秘书及招待员也不必是清一色的女性。(88年翻译)
Under modern conditions,this requires varying measures of centralized control and hence the help of specialized scientists such as economists and operational research experts.