How could anyone tell differences among birds by their legs?

人们怎么能通过鸟的腿来区分它们呢？

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Three years later, a parasitologist at Florida Museum of Natural History in Gainesville called David L. Reed showed that differences in the DNA of lice can tell us much about their hosts.

3年后，来自于盖恩斯维尔的佛罗里达州国家历史博物馆的寄生物学家大卫·l·里德指出，虱子基因的差异会告诉我们许多有关宿主的信息。

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Now look, the apple and the pear are all fruits. Please observe their appearances then tell us what's the same and the differences between them?

现在，我手中拿的苹果和梨都是果实，请大家从外部观察它们都有什么相同点和不同点？

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Tell Congress to get past their differences and send me a road construction bill -- (applause) -- so that companies can put tens of thousands of people to work right now building our roads and bridges and airports and seaports. (Applause.) I mean, think about it.

WHITEHOUSE: President Obama at Johnson Control��s Battery Plant

Time will tell, but it pays to understand that the differences between clean energy sectors are often greater than their similarities.

FORBES: Top Performing Clean Energy Funds in 2010