The use of categories reinforces my previous recommendation: it limits the scope of changes to Object to the body of the use clause in the easyb DSL.
categories的使用加强了我之前的建议：它将对Object的修改范围限制为easybdsl中use子句。
If so, it skips the validation process by using the WHEN clause in the trigger body.
如果已经执行了验证，那么在触发器代码体中使用when子句跳过验证过程。
Gets the length, in bytes, of the body of this exception-handling clause.
获取此异常处理子句的主体的长度(以字节为单位)。
The catch clause can handle exceptions thrown either from within the member initialization list or from within the constructor body.
catch子句既可以处理从成员初始化列表中抛出的异常，也可以处理从构造函数函数体中抛出的异常。
The catch clause can handle exceptions thrown either from within the member initialization list or from within the constructor body.
catch子句既可以处理从成员初始化列表中抛出的异常，也可以处理从构造函数函数体中抛出的异常。
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