教科文组织发起《世界记忆计划》就是为了保护这些宝贵的文献遗产，提高当代人和后代人对文献遗产难以估量的价值的认识。

UNESCO's Memory of the World Programme was launched to safeguard valuable documentary heritage and to raise awareness about its inestimable value for present and future generations.

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他提供的信息价值难以估量。

The information he provided was of inestimable value.

《牛津词典》

价值。然而，它却难以估量的实用价值。

However, it has inestimable practical value as well.

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