短语讲解：

1. They say the test can save thousands of lives every year.

thousands of 数千的
例句：Thousands of files were allegedly downloaded to his computer.
他的电脑被指下载了数以千计的文档。

2. Doctors there are using a small piece of cotton covered with distilled white vinegar - the vinegar can be bought at almost any market in Africa.

cover with 用…遮盖住，用…填满
例句：Carefully set your plate on the rack, then cover with the lid.
把鱼盘小心的放在蒸架上，盖上锅盖。

3. Most cervical cancer comes as a result of the human papillomavirus, which is passed through sexual contact.

as a result of 由于…的结果；起因
例句：As a result of this new awareness, attitudes toward health are changing.
由于认识到了这一点，人们对待健康的态度正在转变。
pass through 经过； 通过
例句：Attendees must pass through airport-like security.
参加者必须通过机场式的安检。
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