有了这个想法后，还有一种想当然是需要使用某种分配或复制机制来在机器之间复制键/值对。

When faced with this idea, the temptation is to assume that you need some sort of distribution or replication mechanism that will copy the key/value pairs between the machines.

youdao

然而，不管是父表还是子表，目前还不支持复制外键。

However, it does not currently support copying of foreign keys, either parent or child.

youdao

复制照片url是不允许的，因为URL是对象的键。

Duplicate photo URLs will not be allowed, because the URL is the key of the object.

youdao