If the person at the desk next to you is staring at his computer screen with a grin on his face, don't be alarmed. He's probably only looking at a bulletin board.
如果你身邊有人，正對著電腦螢幕發笑，別擔心、也別緊張，他不是頭腦有問題，他可能只是在看電子佈告欄。