在合同履行中，不安抗辩权制度的设立，对维护交易秩序，保障交易安全起到积极作用。
In the performance of the contract, uneasy demurring right system's establishment to maintain the transaction order and the safeguard transaction security plays the positive role.
在合同履行中，实际使用数量由数量测算员加以衡量，并在这些数量的基础上确定对承包商的付款。
As the contract is carried out, the quantities actually used are measured by a quantity surveyor and the contractor is paid on the basis of these amounts.
他逃避履行他与球队合同中在二月为他们踢球的协议。
He welshed on his agreement with the team that he would play for them in February.
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