l理论

product <strong>l</strong>ife cycle chart

business chart drawing as p<strong>l</strong>an flip board in office.

概念和主题,垂直画幅,粉笔画,无人,符号,箭头符号

finance business graph on cha<strong>l</strong>kboard economy

图表,脑风暴,边框,形状,无人,符号,方形画幅,知识