押（看押）、鸭（鸭子）
造句
其中，质量监督控制水平及有效性和工程款支付决策是BT甲方的决策变量，质量预防控制水平是BT乙方的决策变量。
In the models, quality supervise level and money payment variables for contract are decided by BT project owner, quality prevention level variables for contract are decided by BT contractor.
