In the absence of this attribute in the configuration, the default behavior is to not perform credential migration.
如果配置中缺少此属性，默认行为将是不执行凭据迁移。
Analysts attribute weakening deposit accumulation to the migration of funds from savings accounts to wealth-management products.
分析者把这归因为存款收益降低导致资金从储蓄账户向理财产品转移。
One example of when to override the migration is when you regularly use the class attribute to indicate semantic information.
这里有个例子，假设经常使用class属性表示语义信息。
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