最后的结果是程序员不能确定输入何时无效，也不能确定是什么打断了和用户及数据本身的隐式的约定。
The end result is that the programmer cannot determine when the input is invalid, which breaks an implicit contract with users and the data itself.
两个企业签订的抵押合同有效，但双方在抵押合同中“如B企业不能支付到期货款，该厂房的所有权直接归A企业所有”的约定无效。
The mortgage contract signed by Company A and B is valid, but the statement that if Company B couldn't pay for the goods, the machine tools belonged to Company A is invalid.
约定一致的发生条件过于苛刻；绝对无效原则有诸多弊端，宜采相对无效原则。
The condition of unanimous agreement is too harsh; the principle of absolute invalidity has many disadvantages and the principle of relative invalidity should be more appropriate.
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