Objective: To discuss the relation of rickets and blood lead level.
目的：探讨佝偻病的发病及治疗与血铅水平的关系。
Objective To investigate the relation of sleep duration and physical activity (PA) level to obesity.
目的：通过大样本横断面研究，初步探讨睡眠时间、身体活动水平和肥胖的关系。
The supply and demand relation runs through the whole level of supply chain.
供需关系贯穿供应链的整个过程。
There exists close relation between maintenance cost and maintenance level of aircraft engine.
航空发动机送修费用与送修等级紧密相关。
It has close relation between maintenance cost and maintenance level of aircraft engine.
航空发动机送修费用与送修等级紧密相关。
It has close relation between maintenance cost and maintenance level of aircraft engine.
航空发动机送修费用与送修等级紧密相关。
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