根底的英文：
bedrock

The reed growing on the wall -- top-heavy, thin-stemmed and shallow of root
墙上芦苇，头重脚轻根底浅

He had to inquire into the cause of the matter.
他不得不追问事情的根底。

Petroleum or oil photogeology is primarily an evaluation of bedrock conditions.
石油或石油摄影地质主要是研究基岩情况的。

Horseshoe Bend is a looping meander entrenched into the bedrock.
马蹄湾是挖沟进入基岩的环状曲流。

Petroleum or oil photogeology is primarily an evaluation of bedrock conditions
石油或石油摄影地质主要是研究基岩情况的。

One of a series of short scars made by glacial drift on a surface of bedrock.
冰川漂流物在基岩表面留下的一系列短痕之一.

"bedrock:The solid rock that underlies loose material, such as soil, sand, clay, or gravel."
基岩:松散地质下的大石块,如土、沙、陶土或碎石。