production operation短语¹³¹⁶²⁰⁺³ 基本例句 生产活动 None of this knowledge can be acquired apart from activity in production.离开了生产活动就不可能获得任何这种知识。 No unit or individual without appointment shall engage in production activities of ephedrine.未经指定的任何单位和个人，不得从事麻黄素的生产活动。