1. unforgettable adj 难忘的
例句：The trip to the Great Wall was an unforgettable experience for me.
那次去长城的旅行对我来说是一次难忘的经历。
2. enthusiastic adj 热情的；热烈的；热心的
例句：Our English teacher is very enthusiastic and she always makes her class interesting.
我们的英语老师非常热情，她总是让她的课很有趣。
3. energetic adj 精力充沛的，有活力的
例句：My grandfather is over seventy years old, but he is still energetic.
我爷爷已经七十多岁了，但他仍然精力充沛。
4. talkative adj喜欢说话的；多嘴的；健谈的
例句：My little sister is talkative and she keeps asking me questions all the time.
我的妹妹很健谈，她总是不停地问我问题。
5. impressive adj 印象深刻的
例句：His speech at the school meeting was really impressive.
他在校会上的演讲真的令人印象深刻。
6. traditional adj 传统的
例句：Eating dumplings on the Spring Festival is a traditional custom in China.
春节吃饺子是中国的一个传统习俗。
7. practical adj 实践的，实际的
例句：Your advice is very practical and helpful for my study.
你的建议非常实际，对我的学习很有帮助。
8. similar adj 类似的，相似的
例句：My schoolbag is similar to yours, but mine is blue.
我的书包和你的相似，但我的是蓝色的。
9. convenient adj 方便的，便利的
例句：It is very convenient to buy things online with a mobile phone.
用手机网购非常方便。
10. sooner or later 迟早，早晚
例句：If you don't work hard, you will fail the exam sooner or later.
如果你不努力，迟早会考试不及格的。
11. more or less 或多或少，差不多，几乎
例句：The answers of the two students are more or less the same.
这两个学生的答案差不多一样。
12. once in a while 偶尔，时不时地
例句：I go to the cinema once in a while with my friends.
我偶尔和朋友去看场电影。
13. now and then 偶尔，有时
例句：Now and then I write a letter to my pen pal in England.
我有时会给英国的笔友写封信。
14. willingly adv 情愿地
例句：Tom willingly helped his mother clean the house last Sunday.
上周日汤姆心甘情愿地帮妈妈打扫了房子。
15. unexpectedly adv 出乎意料地
例句：Unexpectedly, I met my primary school teacher on the bus yesterday.
昨天我出乎意料地在公交车上遇到了我的小学老师。
16. unwillingly adv 不情愿地
例句：The boy unwillingly shared his candy with his little sister.
那个男孩不情愿地把糖果分给了妹妹。
17. doubtful adj 可疑的；令人生疑的；疑心的；不能确定的
例句：I am doubtful about whether he can finish the work on time.
我对他能否按时完成工作表示怀疑。
18. immediate adj 立即的，立刻的，马上
例句：When you see a fire, you should take immediate action.
当你看到火灾时，应该立即采取行动。
19. clear adj 清楚的，清晰的
例句：The teacher gave us a clear explanation of this math problem.
老师对这道数学题给出了清晰的解释。
20. cautious adj 小心翼翼的
例句：Be cautious when you cross the busy street by yourself.
你一个人过繁忙的马路时要小心。
