Privacy, in plain speech.隐私，用大白话。

This marketing site stores a language choice in this browser (loohcs-lang). It does not use your location. Demo rounds on these pages do not create an account. A real class uses the existing login, which this page does not bypass.这个公开页只在这台浏览器里记住语言（loohcs-lang）。不按你所在的位置判断。这些页面上的演示不会开账号。真实课堂用现有的登录，这一页不会绕过它。