使用现在分词短语yielding作为结果状语，表达了销售与利润之间的因果关系。
Gary Dahl was once an advertising executive. In April 1975, while at a bar with friends, he overheard someone complaining about their pet. He jokingly remarked to his friend, "The perfect pet would be a stone; it needs no feeding, no bathing, and it won't get sick or die."
What began as a joke soon inspired Dahl to turn the idea into reality, leading to the creation of the "Pet Rock." Designed to mimic a real pet, each "Pet Rock" came in a cardboard box with air holes and straw for comfort, complete with a pet training guide.
Each "Pet Rock" was sold for $3.95, yielding a net profit of $3 per unit. In just the first six months on the market, the "Pet Rock" generated $15 million in revenue for Dahl.
加里·达尔（Gary Dahl）曾是一名广告公司的行政人员。1975年4月，在一次朋友聚会中，他偶然听到有人在抱怨养宠物的烦恼。当时，他随口对朋友开玩笑说：“最完美的宠物应该是石头，它既不需要喂食，也不用洗澡，更不会生病或死亡。”
这起初只是一句玩笑，但达尔很快被这个灵感所触动，并决定将其付诸实践，于是“宠物石”（Pet Rock）应运而生。为了让“宠物石”看起来更像真正的宠物，它们被装在带有通风口的纸盒里，里面铺满了稻草，并附带了一份“宠物训练指南”。
每个“宠物石”的售价为3.95美元，净利润为3美元。在投入市场的短短半年内，“宠物石”就为达尔带来了1500万美元的收益。