It is a question of long work, as I said, and it cannot be changed at once.
如前所述，那是个长久下功夫的问题。而且它不是一下子就能改变的。
During the execution of a bulk copy operation, this collection can be accessed, but it cannot be changed.
在执行大量复制作业期间，可以存取这个集合，但是无法变更它。
It cannot be changed or deleted.
不能更改或删除。
It cannot be changed or deleted.
不能更改或删除。
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