内存管理简单,"new"构造对象,对象释放(automatic garbage collection) 可靠的语言: compile-time checking和run-time checking
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垃圾回收器执行回收，尝试为对象释放第0级托管堆中的地址空间。
The garbage collector performs a collection in an attempt to free address space in generation 0 for the object.
当数据库对象创建时，流程会创建个文档，且在数据库对象释放时关闭文档。
The procedure creates a document whenever a database object is created, and closes the document when a database object is released.
一旦应用程序的数据访问部分已经完成，还应该关闭数据对象，以便释放与之关联的连接对象。
Data objects should also be closed once the data access part of your application is complete, so that the connection object associated with it is released too.
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