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托福作文词汇变换
(1) 进步、提高：improve, ameliorate, develop, remedy, revise, enhance, enrich, upgrade, refine
(2) 重要的、关键的：important, significant, momentous, considerable, essential, valuable, distinctive, great, weighty, major, serious, grave, vital, capital, substantial, material, conspicuous, striking, prominent, eminent, noticeable, consequential
