但它不仅可以序列化栈，还可以序列化堆中的对象。

But it does have the ability to serialize not only the stack but also objects on the heap.

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栈中最底部的是任务的起始活动——一般是用户在滑出的程序列表中选择启动的活动。

The root activity in the stack is the one that began the task — typically, it's an activity the user selected in the application launcher.

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并在此基础上提出了基于栈结构的支持度计算算法，该算法仅对数据库进行一次扫描，即可实现候选序列的计数操作。

Then it presents a support computing algorithm based on stack structure, which can count the candidate sequences by scanning the database only once.

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