我们讨论很多实践，包括了加拿大国家研究委员会的Hakan Erdogmus的一项实践。
We discussed a few experiments, including one by Hakan Erdogmus of the Canadian National Research Council.
加拿大国家研究委员会的专家说，《蒙娜丽莎》已经很脆弱了，如果不妥善保护的话，它承受不了太多的破损。
The experts from Canada's National Research Council said the painting was in fragile condition but should not suffer too much damage if taken care of properly.
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