Accepting this in principle is one thing; using it in practice is another.

接受上述原则是一回事，在实务上应用又是另一回事。

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This technology is using the principle of catalysts in chemical process.

本技术采用化学处理过程中催化剂的作用。

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This technology is using the principle of catalysts in chemical process.

本技术采用化学处理过程中催化剂的作用。

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