- law of substitution
- 代用: substitute
- 法则: rule; law
- 闭塞代用法: block applied method
- 用法: use; usage 用法说明 directions (for use); 学习工具的用法 learn the use of tools
- 代用: substitute 代用材料 substitute materials; alternate material; ersatz materials; 代用品 substitute; substitution; adultment (石油); 代用饲料 substituted foods
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