堆栈层已经被服务组件替换掉了，由于有这么多的重用存在，使得这些堆栈几乎全部消失。
Stack layers have been replaced by service components and there is so much reuse that the stacks have all but disappeared.
堆栈层已经被服务组件替换掉了，由于有这么多的重用存在，使得这些堆栈几乎全部消失。
Stack layers have been replaced by service components and there is so much reuse that the stacks have all but disappeared.
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