He is under no contractual obligation to buy.
他没有合同上的购买权利。
He is under no contractual obligation to buy.
他没有合同上的购买义务。
But we cannot ignore the contractual obligation of the architect.
但不能因此而忽视对建筑师的约定义务。
You have a contractual obligation to finish the building this month.
你受合同的约束，要在本月完成这项建筑。
You have a contractual obligation to finish the building this month.
你受合同的约束，要在本月完成这项建筑。
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