基石: footing stone; anvil; rock; cill; foundation stone; cornerstone 短语和例子剩余价值学说是马克思经济理论的基石。 the doctrine of surplus value is the cornerstone of marx's economic theory.; 基石线 [土] sommering lines
加价或减价条款: uof down alteration or price clauseuor down alteration of price clauseup or down a iteration of price clause
