Leaf area index (LAI) is an essential parameter for monitoring crop growth dynamic.
叶面积指数(LAI)是估算作物生长的关键参数。
Scores of sensory quality of a building is an essential parameter in the evaluation of a unit engineering quality.
观感质量的评定得分率，是组成单位工程质量“合格”、“优良”等级的内容之一。
Fatigue strength of steel is an essential parameter in designing mechanical parts and analysing their reliability, but fatigue strength of steel is difficult 'to be got in manufacture.
钢材的疲劳极限是对机器零件进行抗疲劳设计及可靠性分析的必需数据，但许多钢材的疲劳极限数据往往很难查找。
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