reactant concentration的用法和样例：
例句
- The ratio changes with reactant concentration, and could be used to optimize syntheses conditions of carbyne.
结果表明，两者比值对反应物浓度的变化具有相关性，可用作碳炔材料制备中实验条件的优选手段。 - When the attractant or stimulant concentration exceeds the receptor limits, the offering is seen as food.
当诱食剂或刺激物浓度超过受体的阀值时，供应物就被看作食物。
