词汇讲解：
1. spread n. 传播, 蔓延
例句：The spread of cholera alarmed the whole city.
霍乱流行使全城的人都恐慌了。
2. double vi. 变成两倍;增加一倍
例句：The child birthrate in that area has doubled.
该地区的婴儿出生率已经增加了一倍。
3. advise v. 劝告, 提建议
例句：He advised me to rest.
他劝我休息。
4. pregnancy n. 怀孕; 妊娠
例句：This was her second pregnancy.
这是她第二次怀孕。
5. promote vt. 促进; 推动; 增进
例句：The organization works to promote the trade between nations.
该组织旨在促进各国之间的贸易。
6. inject vt. 注射, 注入
例句：The doctor has injected him under the skin.
医生已给他皮下注射了一针。
7. effective adj. 有效的; 生效的
例句：The medicine is effective against cancer.
这药物治癌有效。
8. involve vt.使某事物成为必要条件或结果; 需要；使参与, 牵涉
例句：The demonstration involved 200 students.
有200名学生参加了这次示威游行。
9. journal n. 杂志, 期刊；日志, 日记
例句：He kept a journal during his visit to Japan.
他在访问日本期间坚持记日记。
10. compare vt. 比较,对照
例句：Compare this with that, and you will see which is better.
将这个与那个比较一下,你就会知道哪个比较好了。
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