1. The marriage was annulled after it was discovered that one of the parties was already married.

这段婚姻被宣告无效，因为发现其中一方已经结过婚。

2. The contract was annulled due to a breach of confidentiality.

由于违反保密协议，合同被宣告无效。

3. The judge ruled that the will was annulled because it had been forged.

法官裁定遗嘱被宣告无效，因为遗嘱是伪造的。

4. The decision to annul the election results was met with protests from the opposition party.

取消选举结果的决定引发了反对党的抗议。

5. The company's merger was annulled by the regulatory authorities due to antitrust concerns.

由于存在反垄断问题，监管机构宣布取消公司的合并。

6. The contract was annulled by mutual agreement between the two parties.

双方达成共识，同意取消合同。