underneath

The mechanic found the oil leak underneath the engine block after raising the car.

(Chinese) 机械师在升起车后，在发动机缸体下方发现了漏油点。

I found my missing passport underneath a pile of old magazines on the coffee table.

(Chinese) 我在咖啡桌上一堆旧杂志下面找到了我丢失的护照。