A valid id is acceptable as an id in the preferred source.
有效的ID可以作为首选源中的ID接受。
All other operations are passed through to the preferred source.
将所有其他操作传递到首选源。
The pattern should support efficient updates of the preferred source, but this is somewhat problematic.
该模式应该支持对首选源的高效更新,但是这可能会带来问题。
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