rar·i·fy /-əˌfaɪ/ (v.)使[氣體] 變稀薄;使成精細
rar·i·fy /ˈrærəˌfaɪ, ˈrɛr-/ 動詞
rarify v : make more complex, intricate, or richer; "refine a design or pattern" [syn: complicate, refine, elaborate]