Q2: How can one collect this information? What is the source for this information (discussing, and some phrases that draw common agreement or interest should be presented on the blackboard, such as brochure, sales clerk, catalogue, commercial, advertisement, those who have purchased the product, consulting expert, etcQ2: How can one collect this information? / What is the source for this information? (discussing, and some phrases that draw common agreement or interest should be presented on the blackboard, such as: brochure, sales clerk, catalogue, commercial, advertisement, those who have purchased the product, consulting expert, etc.)