strat·i·fy /ˈstrætəˌfaɪ/
(vt.)(使)成層
Strat·i·fy v. t. [imp. & p. p. Stratified p. pr. & vb. n. Stratifying ] To form or deposit in strata, or layers, as substances in the earth; to arrange in strata.
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stratify
v 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"
[also: stratified]