The contract was declared null and void.(合同被宣布無效。)

If the contrary happens, it is by this very fact null and void.(如果情況相反，它是由這個非常事實上是無效的。)

The marriage was declared null and void.(婚姻已宣告無效了。)

Non observance of one or more of the above mentioned articles will render this agreement null and void.(不遵守本合同上述任何條款的，將使本合同作廢失效。)

Almost every new law makes some old one null and void.(幾乎每一新的法律實施都使得某一舊的法律無效。)

The court ruled that the claim was null and void .(法庭裁決此項要求無效。)

The contract was declared null and void by the competent authority.(主管部門宣布該合同無效。)

If the applicant has no insurable interest to the subject matter of insurance, the insurance contract will be null and void.(保險利益決定保險合同的效力問題，投保人對保險標的不具有保險利益的，保險合同無效。)

Otherwise, it will lead to cooperative development contract is null and void.(否則，它會導致合作開發合同是無效的。)

If no such supplementary agreement can be reached, the arbitration agreement shall be null and void.(達不成補充協議的，仲裁協議無效。)