valid target

例句：

1. 1.The new policy is valid for the next three months.
   这项新政策有效期为三个月。
2. 2.The test results are valid only if they meet the required criteria.
   测试结果只有在满足要求的标准时才有效。
3. 3. The contract is valid until the expiration of the agreed-upon term.
   合同有效期至约定期限届满。