beneath

The treasure chest was buried three feet beneath the surface of the sandy beach.

(Chinese) 藏宝箱被埋在沙滩表面下方三英尺处。

She wore a thick woolen sweater beneath her heavy winter coat to stay warm.

(Chinese) 她在沉重的冬装大衣下面穿了一件厚羊毛衫以保暖。