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Cicadas Swarm Wide Portions of US The cicadas are back. Over the past few weeks, across a wide swath of the eastern United States, the notoriously noisy bugs have emerged by the billions from their long, underground adolescence. On a muggy afternoon
VOA标准英语2011年(六月)
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单词解析速记
This is Scientific American's 60-second Science. I'm Karen Hopkin. This will just take a minute. If you were a bird, how big could you be? Well, an ostrich can weigh 400 poundsbut it cant get off the ground. So what if you want to fly? University of
Scientific American(六)月
This mass roosting takes place soon after the summer nesting season. Its a chance for the birds to molt before they fly south for the winter. As Vauxs swift numbers reach a peak in mid September, they attract attention from the locals. Coopers hawks
探索与发现2013年
Molting Molds Flying Bird Size Limit A study in the journal Public Library of Science Biology finds that it's the rate at which flying birds can replace their flight feathers that determines how big they can grow and still get off the ground. Karen
60秒科学
Captain Nemo walked in front, and his companion followed us a few steps to the rear. Conseil and I stayed next to each other, as if daydreaming that through our metal carapaces, a little polite conversation might still be possible! Already I no longe
《海底两万里》中英双语有声读物