It may happen that in a single contract, a series of transactions are required to be performed, each act constituting an integral part of the contract or substantial part of the performance of the obligation.
可能会出现以下情形：在某一项单一合同中会要求履行一系列交易，而其中每一行为都构成了合同的一个不可分割的部分或履行了大部分义务。