知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Have you ever ever saved a piece of chewed chewing gum and began chewing it once again later on? Have you ever named a 'he' she or even a 'she' a 'he?' What was the reaction? Have you ever named a Ladies sir or a Man "ma'am?" https://www.ecom-group.com/training-events/sap-cloud-integration-suite-cld900/