1. The smallest amount of a physical quantity that can exist independently, especially a discrete quantity of electromagnetic radiation. 
   量子物理量中可独立存在的最小的量，尤指电磁辐射中不连续的量
2. principle of least action 
   最小作用量原理
3. A substance that has been treated to destroy its toxic properties but retains the capacity to stimulate production of antitoxins, used in immunization. 
   类毒素经过处理后已消除其毒素特性的一种物质，但仍保留有激发产生抗毒素的能力，用于免疫中
4. a mixture of toxin and antitoxin used to immunize against a disease. 
   用来提高抵抗疾病的免疫力的毒素和抗毒素的混合物。
5. an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal. 
   一种能抵抗蛇或其它有毒昆虫或动物之毒素的抗毒素。

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