词汇讲解：
1. clue n. 线索,迹象,提示
例句：The police have no clue to his identity.
警察没有可以确定他的身份的任何线索。
2. mystery n. 神秘的事, 难以理解的事物
例句：The flying saucer is yet an unsolved mystery.
飞碟仍然是未解之谜。
3. extinction n. 熄灭,消灭,灭绝;废除
例句：The plant is now in danger of extinction.
这种植物现在有绝种的危险。
4. shrink v. 收缩; 退缩
例句：The number of students of this school has shrunk.
这所学校的学生人数在减少。
5. melt v. (使)融[溶, 熔]化; 溶解
例句：The ice will melt when the sun shines on it.
当太阳照到冰的时候, 它就融化了。
6. permanent adj. 永久(性)的, 固定的
例句：The coat gives permanent protection against heavy rain.
这种防雨衣经久耐用。
7. demonstrate vt. 论证, 证明
例句：All of those demonstrated the correctness of his analysis.
这一切都证明了他分析的正确性。
8. date vt. 鉴定…的年代
例句：I can't date the pot exactly, but it must be very old.
我不能精确断定这个罐子的年代, 不过时间一定很久远了。
9. heal v. (使)愈合, 治愈, (使)恢复健康
例句：The wound has not yet healed.
伤口尚未愈合。
10. submit vt. 建议, 主张, 申辩; 提交, 呈递
例句：I submitted my resignation yesterday.
我昨天递交了辞呈。
11. register v. 记录; 登记; 注册
例句：An increasing number of students are registering for degree courses each year.
每年, 越来越多的学生注册
学习学位课程。
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