1. Chemistry that deals with minute quantities of materials, frequently less than one milligram in mass or one milliliter in volume. 
   微量化学研究极小数量物质的化学，通常研究对象质量小于一毫克或体积小于一毫升
2. Zemel says that when calcium levels are low, the body releases a hormone that helps squeeze the most out of every available milligram of the mineral; 
   泽莫尔博士说，当人体中的钙含量偏低时，身体里就会产生一种荷尔蒙，它能帮助肌体最大限度地吸收所摄入的钙。
3. In a few minute 
   过一会
4. Every minute counts. 
   分秒必争。
5. On a minute-by-minute basis. 
   每分钟的每隔一分钟的，一分钟一分钟的

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