吃透英语课本，提升在校竞争力
n. 基础；基本原理；根基
Much of the groundwork has already been done .
准备工作已经完成了很多。
His speech laid the groundwork for independence.
他的演说为独立打下了基础。
n.基础；地基，根基
elements
basis
bed
radical
sole
