2015年Scientific American's Six

If you are lost, you need a map and a compass. The map pinpoints where you are and the compass orients you in the right direction. Migratory birds, on the other hand, can traverseentire hemispheres and end up just a couple of miles from where they br

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Wilder protected areas get eight billion visitors a year, and that's just on land. Underwater reserves? add a million to the tally, which, considering these are protected areas, seems like an insane number of people. It isn't insane. Dane Blumstaine,

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学英语单词
a clay yard
aci catena
ahakhav
algae coal
antiabortionism
Baignes
bias-belted
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brittle gels
Chief-agglutination
chill test
clay grease
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Forster
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Gobindapāra
hairy squash
have a great loss of
heat storage boiler
hydronephrosis of pregnancy
iacovou
individual guidance
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intracellular toxoid
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kandora
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Lagrangeville
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Wallace add tree
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zaptieh