奠基石的英文：
corner stone
cornerstone
foundation stone

参考例句：

We hailed the agreement as a"cornerstone"
我们赞扬这次协议为“奠基石”。

They were the distinguishing foundation of all human societies; the bedrock on which all else came to be erected
它们是所有人类社会特有的基础;并逐步建立其它一切东西的奠基石。

corner是什么意思：
n. 角，街角；地区；转弯处；困境；角球
v. 使落入圈套，垄断；转弯

scrunch into a corner
蜷缩在角落里

The corner of a small catalog stung the corner of his mouth.
一本小册子的书角砸在他的嘴角上。

Draw a diagonal line from this corner to that corner.
从这个角画一条对角线到那个角。

stone是什么意思：
n. 岩石，石头，石料；石块，宝石，钻石；果核；英石（英国重量单位）
v. 向（某人）扔石块，用石头砸；去掉果核

Level the city stone by stone to an extinct waste.
一块石头一块石头地夷平该市，使它成为一片没有人烟的荒原。

And then he continued to dig for his son, stone by stone.
然后继续挖掘，掀开了一块一块的石头寻找他的儿子。

The lane to the garden was overlaid with stones.
通往花园的小径上铺了一层石子。

cornerstone是什么意思：
n. 基础，基石；柱石；地基

The flood displaced the houses from their cornerstone.
洪水将房屋从地基上冲走。

The cornerstone of this comprehensive project is education and vocational training.
这项全面性计划是以教育及职业训练为基础。

The iron rice bowl was the cornerstone of the communist social system.
“铁饭碗”是社会主义社会的基石