这个方法会防止重复建立和终结执行个体时所产生的额外负荷。
This approach prevents the overhead of repeatedly creating and destroying instances.
对物件成员的呼叫必须在执行阶段解析，这样通常会产生管理引数清单的额外负荷。
Calls to the object's members must be resolved at run time, frequently with the additional overhead of manipulating argument lists.
如果您的运行时环境接近于满负荷运转，您应该考虑在滚动迁移期间为您的配置临时增加一些额外的硬件。
If your run time environment is running close to full capacity, you might consider temporarily adding additional hardware to your configuration during the rolling migration.
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