null and void

例句：

1. 1. The null andvoid of the proposal was evident in itslack of concrete action.
   该提案的空洞和无效显而易见于其缺乏具体行动。
2. 2.The company's decision to null andvoid the contract was a surprise to allparties involved.
   公司决定取消合同的决定让所有相关方都感到惊讶。
3. 3. The nulland void of the agreement meant that ithad no legal effect.
   协议的无效意味着它没有法律效果。