within

The pizza delivery person promised to arrive at our door within thirty minutes.

(Chinese) 披萨外送员承诺在三十分钟内送到我们家门口。

You must complete the examination questions within the two-hour time limit.

(Chinese) 你必须在两小时的时限内完成考试题目。

Firefighters searched for any survivors trapped within the burning building.

(Chinese) 消防员搜寻被困在着火建筑物内部的生还者。

The beautiful park is located within the walls of the old city.

(Chinese) 那座美丽的公园位于老城的城墙之内。