Substitution — Replacing one resource with another. May occur, for example, when the original resource is no longer cost-effective or is diminishing in quantity or quality.
置换——那一种资源换成另一种。可能发生，比如，原始资源不再是有成效的或从数量质量方面削弱了。
Substitution — Replacing one resource with another. May occur, for example, when the original resource is no longer cost-effective or is diminishing in quantity or quality.
置换——那一种资源换成另一种。可能发生，比如，原始资源不再是有成效的或从数量质量方面削弱了。
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