tell-tale screen

例句：

1. 1.The tell-tale screen was a red light that indicated when the door was open.
   那个告密者屏幕是一个红色的灯，当门打开时会亮起。
2. 2.The secret screen was used to hide the information from prying eyes.
   秘密屏幕被用来隐藏信息，不让好奇的眼睛看到。
3. 3.The confidential screen was designed to protect sensitive data from unauthorized access.
   机密屏幕被设计来保护敏感数据，防止未经授权的访问。