Materials enter into these steps in fabricability and substitution of new materials for the parts that did not make it through debugging.

材料进入这些步骤是为了使新材料的可制造性和替代那些没有通过调试的部件。

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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