People should know the causes of their asthma symptoms and try to avoid these triggers.

VOA: special.2009.07.28

So, you're familiar with some of these bacteria like salmonella, or the micro bacterium that causes tuberculosis are shown here.

所以 你们很熟悉像沙门氏菌这样的细菌,或者像这儿的引起结核的小细菌

耶鲁公开课 - 生物医学工程探索课程节选

These are the leading causes of death in 1900.

这些是1900年的主要死亡原因

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

These have all been identified as possible causes of the collapse disorder.

VOA: special.2009.09.22

These are common causes of accidental poisoning.

VOA: special.2009.08.11

Our inability to prevent weapons from being illegally smuggled across the border to arm these criminals causes the death of police officers, soldiers and civilians.

VOA: standard.2009.03.25

But Tilford says these are symptoms and not the root causes of Greece's dilemma.

VOA: standard.2010.02.26

And without a vaccine, Dr.Fauci says the best methods of prevention are these: encourage people to limit the numbers of sexual partners encourage men to use condoms train more doctors to perform adult male circumcision empower women to choose their sex partners and protect themselves from getting the virus that causes AIDS All of these goals still remain major challenges.

VOA: standard.2010.07.17