foundation stone

1. N-COUNT A foundation stone is a large block of stone built into a large public building near the bottom. It is often involved in a ceremony for the opening of the building, and has writing on it recording this. 奠基石[oft with poss]

The official foundation stone for the dam was laid in 1961. 这座水坝的官方奠基石于1961年埋下。

2. N-COUNT The foundation stone of something is the basic, important thing which its existence or success depends on. 根本[usu N 'of' n]

...these foundation stones of the future: education, training, research, development. ...未来之根本：教育、培训、研究和发展。