Memory blocks can be reached in one of two ways -- if the user program holds a reference to that block in a root, or if there is a reference to that block held in another reachable block.

可以以两种方式之一访问内存块 ――或者用户程序在根 (root)中有对这一内存块的引用，或者在另一个可到达的块中有对这个块的引用。

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As a result, updating a column can result in an error when there is a reference to the row you are attempting to update.

因此，当存在对尝试更新的行的引用时，更新列可能导致错误。

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There is a reference to synthesis progress, difficulty and existing problems of high solid polyurethane.

综述了国内外高固含量聚氨酯的合成进展、合成难点及存在问题。

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There is a reference to synthesis progress, difficulty and existing problems of high solid polyurethane.

综述了国内外高固含量聚氨酯的合成进展、合成难点及存在问题。

youdao