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One maybe heavier than the other, for example, the other maybe more lightly built or gracile,比如说一种比另外一种重，而另一种体态更小或更纤细，or maybe that they have a difference in crest on top of the head,或者可能在头上
侏罗纪搏击俱乐部
The World Cup final is about to begin. You want to turn on the TV and get to the right channel. So a small area of your brain called the motor cortex (运动皮层) processes and sends intricate electrical signals to your arm and hand, which allow yo
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Animals that live in cold climates tend to have stubby limbsshorter arms and legseven smaller ears and tails. Picture a penguin and youll see what I mean
Scientific American(十二)月
Sometimes women and men break a nail working on a tough task. Because our keratin claws are no match for the club-like appendages of a critter called the peacock mantis shrimp. They can hammer through crab exoskeletons and even mollusk shells to find
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1. President Bush says marriage between a man and a woman is one of the most important institutions and he's proud to support a constitutional amendment to ban same sex marriages. He spoke today as th
美联社新闻一分钟2006
Hello, I'm Nil Nunes with the BBC News. The British Prime Minister, David Cameron, is preparing for a day of frantic diplomacy in Brussels, as he tries to win support from the twenty-seven other European leaders to achieve the reforms he wants. The d
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