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Substitution of critical raw materials in, for example, electronics and power tools also offers excellent opportunities for finding solutions for raw material problems.

关键原料的替代，譬如在电子和电动工具方面，也为解决寻求原材料难题提供了绝佳的机会。

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Substitution of the materials or equipment shall be subject to the provisions of the Contract.

材料和设备的代用应遵从合同的规定。

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Prof Elliot from QUB said the substitution of "low quality, low value materials for the true foodstuff has plagued food production for centuries".

BBC: Burgers

However, the evidence to date suggests strongly that we may be soon seeing a big substitution of combined intelligence, technology, and behavioral changes in place of raw materials.

FORBES: On The Verge of Change: A View of Our Future Energy World