词汇讲解：
1. sign n. 标记，标志例句：A red light is a sign of danger.
红灯是表示有危险的标记。
2. mourn v. 为…哀痛例句：She mourned the loss of her brother.
她因为失去了哥哥而悲痛。
3. pregnancy n. 怀孕，妊娠例句：Early pregnancy is often accompanied by nausea.
怀孕初期常伴有恶心。
4. affect vt. 影响例句：The tax increases have affected us all.
加税已经影响了我们所有的人。
5. combination n. 结合，组合例句：I had a combination of brevity, clarity, and rhythm.
我求得了既简洁清楚又有节奏感的配合。
6. baldness n. 秃头，光秃例句：She can't resist making jokes about his baldness.
她忍不住拿他的秃头开玩笑。
7. compete v. 竞争，竞赛例句：Who could compete in the Olympics?
什么样人可以参加奥运会？
8. perform v. 表演，执行例句：How did Harry Houdini perform his amazing feats?
哈里•胡迪尼是怎样表演他那精湛迷人的技艺的？
9. pageant n. 盛装游行，壮丽的场面The coronation of the new king was a splendid pageant.
新国王的加冕典礼是一个非常壮丽的场面。
10. false adj. 假的，伪造的例句：These stories are false, just so much blab.
那些故事都是假的，全是一派胡言。
11. individual n. 个人例句：The purpose of the law is to protect the right of the individual.
该法律目的是为了保护个人权利。
12. effective adj. 有效的，生效的例句：Commercial television is an effective medium for advertising.
商业电视是有效的广告宣传工具。
13. prove vt. 证明例句：Only time would prove how much in error that last assumption was.
只有时间才会证明这最后一种说法何其大谬不然。
14. similarity n. 类似，相似例句：There were points of similarity between them.
他们之间有某些相似之处。
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