各气泡的大小大致表示了对应数据集中的数据量。

The size of each bubble is a rough indication of the amount of data in that data set. Some interesting items are

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FETCH 节点使用这些 RID 来定位表空间内的对应数据页面。

These RIDs are used by the FETCH node to position the corresponding data pages in the table space.

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服务实现查询使用密钥查询提供者，并获得与该密钥关联的对应数据对象。

The service implementation queries the provider using the key and gets the corresponding data object associated with that key.

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Associated with every data type in Python is a type, which identifies the kind of thing it is.

在Python中每种类型都对应着一种数据类型，类型确定了对象的种类。

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So, doing a dereference on x follows the arrow to access its pointee.

那么，解除对应x的指针数据的,索引箭头。

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