1. a sample in which every element in the population has an equal chance of being selected. 
   总体中每个成分都有相等机会被抽选的一个样本。
2. the selection of a random sample; each element of the population has an equal chance of been selected. 
   随机抽样；每个有同样被挑选机会的元素。
3. element of electrical circuit 
   电路元件
4. prefabrication of concrete element 
   混凝土构件预制工艺
5. typomorphic element in landscape 
   景观标型元素

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