The salesperson pitched the product features effortlessly, as if it were a performance.

pitched 是动词 pitch 的过去式。pitch 本意是"投掷、抛"，在这里引申为"推销、宣传"，指推销员像投球一样向客户抛出产品信息。这种表达暗示推销过程像表演一样流畅自然。