可同时处理多项任务，并使用更大键盘更快速地进行输入，从而提高工作效率。 WhatsApp takes advantage of a "retail store and ahead" mechanism for exchanging messages concerning two end users. When a person sends a message, it can be saved on the WhatsApp server, which tries to ahead it on the addressee, and frequently requests acknowledgement of receipt. Another application named https://apps-whatsapp.com/whatsapp-web