stratify
英 ['strætɪfaɪ]
美['strætɪfaɪ]
	    - vt. 分层;成层;使形成阶层
 - vi. 分层;成层;阶层化
 
英英释意
- 1. divide society into social classes or castes;
 - "Income distribution often stratifies a society"
 
- 2. form layers or strata;
 - "The rock stratifies"
 
- 3. develop different social levels, classes, or castes;
 - "Society stratifies when the income gap widens"
 
- 4. form, arrange, or deposit in layers;
 - "The fish are stratified in barrels"
 - "The rock was stratified by the force of the water"
 - "A statistician stratifies the list of names according to the addresses"
 
- 5. render fertile and preserve by placing between layers of earth or sand;
 - "stratify seeds"
 
