JDBC 4.0中的这个支持意味着：无需不必要的映射，XML就可以原生地在中间层和数据库之间流动，这也不会在数据库和中间层导致性能开销。
This support in JDBC 4.0 means that XML can natively flow across the middle tier and the database without unnecessary mapping or performance overhead in both the database and the middle tier.
当城市原生污水作为冷热源时，换热器软垢对流动换热的影响不容忽视。
When using the urban original sewage as cool and heat source of heat pump, the effect to heat exchanger is unavoidable and not disregarded about the formation of soft dirt.
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