public static Boolean isOpportunityExistAndLastModifiedInSpecifiedTime(Id accountId,DateTime SpecifiedTime) {
    // 查询Account的IsExpired字段
    Account acc = [SELECT Id, IsExpired__c
                   FROM Account
                   WHERE Id = :accountId];

    // 获取Opportunity中与Account相关的所有Opportunity记录
    List<Opportunity> oppList = [SELECT Id, LastModifiedDate
                                 FROM Opportunity
                                 WHERE AccountId = :accountId];

    // 如果有Opportunity记录
    if (!oppList.isEmpty()) {
        // 查找Opportunity中最晚的LastModifiedDate
        DateTime latestModifiedDate = oppList[0].LastModifiedDate;
        for (Opportunity opp : oppList) {
            if (opp.LastModifiedDate > latestModifiedDate) {
                latestModifiedDate = opp.LastModifiedDate;
            }
        }
        
        // 判断最晚的LastModifiedDate是否距离今天超过6个月
        DateTime sixMonthsAgo = System.now().addMonths(-6);
        if (latestModifiedDate > sixMonthsAgo) {
            return true;//LastModifiedDate在6个月内
        }
    }
    return false;
}