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？
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。
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？
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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