Charles Bradley made a similar suggestion with a conditional promise in advance. He suggested.
Charles Bradley提出了类似的建议，不过他指出还要获得一个有条件的承诺。
A promise conditional on a performance by the promisor is a promise of alternative performances within 77 unless occurrence of the condition is also promised.
以诺言人的某一履行为条件的诺言，为第77条规定的选择履行，条件的出现也是诺言内容的除外。
My promise to help you is conditional upon your good behavior.
我答应帮助你，要以你的品行好为条件。
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