Unless there is a sudden change of political situation, it is not accepted to execute the contract only partially.
除非有什么突然的政局变化,否则执行部分合同不能被接受。
What invariably happens is that a great number of things choose to go wrong at precisely the same moment.
情况经常是这样的,许许多多的事情都偏偏赶在同一时刻出问题,