Researchers have been determined to figure out how bird flu spreads from human to human worldwide.

研究人员下决心要弄清楚禽流感在全球范围内是如何在人与人之间传播的。

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The virus is transmitted to humans by close contact with infected birds or their excrement, and cannot be passed from human to human.

该病毒通过与受感染的鸟类或其粪便的密切接触传播给人类，不能在人与人之间传播。

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Human-to-human transmission can easily occur, and pandemic will therefore break out.

很容易出现人际传播，而且会因此爆发大流行病。

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The investigators say they found no evidence that the university's scientists cheated to prove the existence of human-caused climate change.

VOA: special.2010.04.27

Southern pro-slavery defenders are much more likely to stress a human's duty, than they're ever to stress a human's rights.

南方的亲奴主义者们,相比较人类的权利而言,更加强调人类的义务

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The kind of discipline and self-restraint necessary for an educated mind appears, for him, to be unequally divided among human beings.

那种受过教育者,所必备的纪律与自制，对他而言似乎是不平等地,区隔了人群。

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There has also been occasional human-to-human transmission, according to the World Health Organization.

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Although both jumped the "animal-to-human" barrier, neither disease mutated enough to enable sustained human-to-human infection, said Dr. K.Y.

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Soon, machine-to-machine conversations will outnumber human-to-human and human-to-machine conversations many times over.

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