近义词:1. Abundant(丰富的)- Plentiful(丰富的)2. Assist(帮助)- Aid (帮助)3. Brave (勇敢的)- Courageous (勇敢的)4. Calm (镇静的)- Serene (宁静的) 5. Careful (小心的) - Cautious (谨慎的) 6. Delightful (令人愉快的) - Pleasing (令人感到愉快) 7. Efficient (有效率) - Effective(有效能) 反义词: 1. Abundant (丰富的)- Scarce (稀少的 ) 2. Assist (帮助)- Hinder(妨碍 ) 3. Brave(勇敢 ) - Cowardly(怯懦 ) 4. Calm (镇定 ) - Agitated(激动不宁 ) 5. Careful (小心 ) - Reckless(不计后果 ) 6 .Delightful (令人开心 ) – Displeasing(不令人感到愉快) 7 .Efficient (机能性强) – Inefficient(低效能).