It consists of a detection cell, a photoelectric detector, a signal amplifying and processing system, a display and warning system.
该系统主要由测量室、光电探测器、信号放大与处理系统及显示报警系统等组成。
A warning message will display and the username field in the browser will be cleared.
将显示一条警告消息，并且浏览器中的用户名字段将被清空。
If a username has already been used and the administrator tries to enter it again, the browser will display a warning and the username field will be cleared.
如果某个用户名已经被使用，而管理员尝试再次输入它，则浏览器会显示一个警告，同时用户名字段将被清空。
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