However, in some cases, you will need to read cursors both forward and backward, in which case you should use scrollable cursor.
但某些情况下,您需要游标既能向前又能向后,此时需要使用可滚动游标。
Since the component is read-only, you are free to rebase that view to any baseline, forward or reverse.
由于这个组件是只读模式,您可以自由地重新将这个视图定到任何基线,向前或者向后。
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