4 sentences for 窗口 (chuāng​kǒu — GUI window)

1. 他关闭了多余的浏览器窗口。

   tā guān​bì le duō​yú de liú​lǎn​qì chuāng​kǒu.

   He closed the redundant browser windows.

   Source: Dong Chinese Dictionary

2. 请记得在关闭窗口前保存文档。

   qǐng jì​de zài guān​bì chuāng​kǒu qián bǎo​cún wén​dàng.

   Please remember to save your document before closing the window.

   Source: Dong Chinese Dictionary

3. 电脑屏幕上突然跳出一个窗口。

   diàn​nǎo píng​mù shàng tū​rán tiào​chū yī gè chuāng​kǒu.

   A window suddenly popped up on the computer screen.

   Source: Dong Chinese Dictionary

4. 保存文件时，屏幕上弹出一个确认窗口。

   bǎo​cún wén​jiàn shí, píng​mù shàng tán​chū yī gè què​rèn chuāng​kǒu.

   A confirmation window popped up on the screen when saving the file.

   Source: Dong Chinese Dictionary