My eight-page report examined the nature (本质) of the current market, the products ’ life cycles and their sales/profit return ( 返利 ; 收益 ). In addition to this research, I helped formulate (vt. 制订;规划;构想 ) a product merchandising(merchandise vt. 推销;(运用广告等)销售 ) plan and answered consumers'questions at a local trade show. This brief but challenging introduction ( 初次经历;首次体验 ) to product management convinced(vt. 使确信;使相信 ) me that 1 could be successful and happy in a marketing career. 请从找出以下汉语意思的英语表达: 产品的生命周期________ 制订产品销售计划 ________ 商品展销会;商品交易会 ________ 产品管理 ________