Not freeing global references causes issues not only because they keep the object itself alive but also because they keep alive all objects that can be reached through the object.
不释放全局引用会造成各种问题，不仅因为它们会保持对象本身为活动状态，还因为它们会将通过该对象能接触到的所有对象都保持为活动状态。
Not freeing global references causes issues not only because they keep the object itself alive but also because they keep alive all objects that can be reached through the object.
不释放全局引用会造成各种问题，不仅因为它们会保持对象本身为活动状态，还因为它们会将通过该对象能接触到的所有对象都保持为活动状态。
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