Let's start with the atomic unit of sales and marketing, the purchase.

让我们从销售和市场营销的基本单元——购买开始。

Here at Summer School, we like to show you the atomic units of business, the smallest examples that offer the biggest lessons.

在暑期学校，我们想向您展示业务的原子单元，即提供最大教训的最小示例。