虽然远程应用程序有时需要设置消息头部字段，但这只是例外情况，而不是规则。

Although there are cases where a remote application legitimately needs to set the message header fields, this is the exception rather than the rule.

youdao

注意，对于带有测试的其他方法或字段的调用也会触发这些测试，所以要有一些特殊情况的例外，以防止方面代码中的无限递归之类的问题。

Note that nested calls to other methods or fields with tests will trigger those tests, with some special-case exceptions to prevent infinite recursions in aspect code, etc.

youdao

不过有一个例外，对于“脏(dirty)”表空间中的long型字段和大型对象数据，总是需要进行备份。

The exception is for long field and large object data in "dirty" table Spaces, which are always backed up.

youdao