You should delete messages from your mailbox when no longer needed.你应该把没用的信息从收件箱里删除。There are five new messages in your in-box.你的收件箱里有五条新信息。We'll deliver fully formatted HTML pages right to your inbox.我们将会把完全格式化的超文本网页直接发送到你的收件箱。An email arrives in your inbox.你的收件箱收到一封电子邮件。