Extension tags can be mixed with regular bean definitions, and any number of namespaces can be imported and used in the same document.
扩展标签可以和正规的bean定义混合使用，可以引入任意数目的命名空间，并在同一个文档中使用。
2
Unfortunately, I've had very mixed success with this extension.
遗憾的是，我在使用这种扩展时成败参半。
3
The stress corrosion mechanism in mixed solutions was studied based on the metallographic observations of scanning fracture shapes and crack extension direction.