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。 WhatsApp works by using a "shop and forward" system for exchanging messages between two consumers. When a person sends a concept, it is actually stored on the WhatsApp server, which tries to forward it for the addressee, and repeatedly requests acknowledgement of receipt. A few times https://apps-whatsapp.com/whatsapp-web