1. 表示主要的,重要的词: primary, major, main, chief, important, essential, significant2. 表示充足的:enough, sufficient, plenty, abundant3. 表示适当的:appropriate4. 表示提升,改善,加强:enhance, improve, strengthen5. 表示合法:valid, legal, lawful, rightful6. 表示卓越不凡:extraordinary, excellent, uncommon, remarkable, outstanding.7. 表示很有名气:well-known, noticeable, famous8. 表示义务,有责任去做:compulsory, required, obligatory9. 表示积极,主动:positive, proactive10. 表示合理:sound, rational, correct, sensible, logical, reasonable11. 表示英勇: brave, bold, valiant, heroic, courageous, fearless12. 表示巨大: huge, large, giant, vast, enormous13. 表示牢固稳定:sturdy, strong, firm, tough, stable, hardy