the wedge-shaped piece at the highest point of an arch that locks the other pieces in place
something on which associated things depend for support
collective bargaining – the keystone of industrial democracy — Adlai Stevenson
| 单词 | keystone |
| 释义 | keystonenounthe wedge-shaped piece at the highest point of an arch that locks the other pieces in place something on which associated things depend for support collective bargaining – the keystone of industrial democracy — Adlai Stevenson |
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