metabolic concentration的用法和樣例：
例句
- When the attractant or stimulant concentration exceeds the receptor limits, the offering is seen as food.
當誘食劑或刺激物濃度超過(guò)受體的閥值時(shí)，供應物就被看作食物。 - The ratio changes with reactant concentration, and could be used to optimize syntheses conditions of carbyne.
結果表明，兩者比值對反應物濃度的變化具有相關(guān)性，可用作碳炔材料制備中實(shí)驗條件的優(yōu)選手段。
