一些冠状病毒导致人类疾病，另一些则在动物中传播疾病，包括骆驼、猫和蝙蝠。
Some corona-viruses cause disease in humans, others spread illness among animals, including camels, cats and bats.
一项新的研究表明，香烟中的烟草蕴藏一个细菌宝藏——字面上来讲就是成百上千的不同种细菌，包括引发人类众多疾病的细菌。
The tobacco in cigarettes hosts a bacterial bonanza — literally hundreds of different germs, including those responsible for many human illnesses, a new study finds.
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