1. A protein or other antigenic substance present in only some members of a species and therefore able to stimulate antibody production in those members that lack it. 
   同种抗原；同族抗原一种蛋白质或其它的抗原物质，只存在于一个物种的一些成员体内，因而能刺激缺乏它的那些成员产生抗体
2. a chronic progressive anemia of older adults; thought to result from a lack of intrinsic factor (a substance secreted by the stomach that is responsible for the absorption of vitamin B-12). 
   老年人的一种慢性发展的贫血症。
3. a substance that oxidizes another substance. 
   氧化其他物质的物质。
4. A fluid substance is any substance which flows. 
   流动的物质为流体。
5. A simple substance, mixture 
   单纯的物质、混合物

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• 1. 家畜发育不足
  lack point抓不住要点...lack substance家畜发育不足...lack for缺乏
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