misc. agreeability
对满贯的约定性加倍 Slam double convention
场合约定性 context-bound
否牺牲的约定性加倍 DOUBLE FOR SACRIFICE
约定性开叫 club conventions ; two-diamonds artificial opening
约定性叫牌 cipher bid
约定性强开叫 two-club strong artificial opening
约束性规定 Restrictive covenant
改变约定的性质上 changes in nature of engagement
约束性固定成本 committed fixed cost
关键性约定 key stipulation
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