He's seen it in a pair of birds dozing side by side in the zoo and in a single pet bird sleeping by a mirror.
他在动物园里的一对并排打盹的鸟和一只在镜子旁睡觉的宠物鸟身上看到过。
Keeping a single checklist may not be sufficient - twitchers often keep checklist for particular seasons or locations to keep track of just where they've seen the many birds on their life list.
对于他们，只记一份清单是不够的——“猎奇党”鸟人常常为不同的季节和不同的地点都单独列出一份清单，以便记录他们在哪儿看到的鸟最多。
Flying from their nests at the break of dawn, all the ocean birds appear only in the last single frame.
所有在黎明破晓时从巢穴中飞出来海鸟都只出现在最后一帧中。
The marks and tracks found in the rocks of the Haman formation are from two different species of birds, or perhaps a single species working at two different speeds.
这些在哈曼组的岩石中发现的印记和足迹来自两种不同的鸟类，或可能是来自啄食速度不同的同一类鸟。
Worst were the birds: 2, 079 have been collected alive, every single one of them visibly oiled.
最惨的是鸟类，搜集到的2,079只活的鸟类中，每一只油污都肉眼可见。
The single most important public health priority at this stage is to warn people about the dangers of close contact with sick or dead birds infected with H5N1.
目前一项最重要的公共卫生重点是告诫人们有关密切接触受染h5n1型病毒而患病和死亡的禽类的危险。
So far, Rovio has yet to spend a single penny on marketing or advertising, reports TechCrunch, but sells a million Angry Birds toys and a million T-shirts every month.
Techcrunch报道说，到目前为止，《愤怒的小鸟》没有在市场营销或者广告上花过一分钱，然而每个月都能卖出一百万个愤怒的小鸟玩具和一百万件T恤。
So far, Rovio has yet to spend a single penny on marketing or advertising, reports TechCrunch, but sells a million Angry Birds toys and a million T-shirts every month.
Techcrunch报道说，到目前为止，《愤怒的小鸟》没有在市场营销或者广告上花过一分钱，然而每个月都能卖出一百万个愤怒的小鸟玩具和一百万件T恤。
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