Birding is a popular pastime that naturally leads to an interest in bird identification.
观鸟是一项很流行的休闲活动，自然而然地会使你对鸟类鉴别产生乐趣。
Physical characteristics that are important in bird identification include colors, markings, and bill or beak.
羽色、特殊标记以及鸟喙形状等特征在鸟类识别中有很大作用。
The researchers linked the rate of evolution in the parasites to the rate of evolution in bird hosts in the West Indies.
研究者将寄生虫的进化率和西印度群岛的禽类宿主的进化率联系起来。
The boy obviously needs a lesson in bird species, but his compassionate intention is a sign that he could grow up to be a genius.
很显然，小男孩需要上一堂关于鸟类的课，但他的慈悲意识，表明了他将来会是个天才。
Three of the cases they studied found that the rise of West Nile virus in the U.S. corresponded to decreases in bird population density.
他们在研究过的三个案例中发现西尼罗河热在美国的的流行与鸟类种群密度的下降相关。
The findings showed that over 20 years there was a 71 percent drop in native butterfly populations and a 54 percent drop in bird populations.
结果发现，20年来本地蝴蝶的数量下降了71%、鸟的数量下降了54%。
In terms of appearance, kites were frequently designed in the image of a native bird, or a Maori god, and sometimes, perhaps less often, a well-known hero.
就外形而言，风筝通常是按照当地鸟类或毛利神的形象设计的，有时，可能没那么频繁，风筝的形象是一位著名的英雄。
It turned out that there were actually four times as many bird pairs or couples living in the stream edge habitat compared to the area away from the stream.
事实证明，生活在溪边栖息地的鸟对数量是远离溪边栖息地的四倍。
The girl looked up and saw that the voice came from a bird hanging in a cage on the wall.
女孩抬头一看，声音是从挂在墙上笼子里的一只鸟发出来的。
There was once a man in South America who had a parrot, a pet bird that can imitate human speech.
从前，南美洲有个人养了一只鹦鹉，一种能模仿人类说话的宠物鸟。
As influenza viruses pass from one person, or bird, to another, they normally pick up random changes in their genes because of errors in viral replication.
当流感病毒由一个人或一只鸟传给另一个人或鸟时，由于病毒复制错误，它们通常会带上基因中的随机变化。
I'm going to talk today about research into a particular species of bird—the New Caledonian crow, whose natural habitat is small islands in the Pacific Ocean.
我今天要讲的是对一种特殊鸟类的研究——新喀里多尼亚乌鸦，它的自然栖息地是太平洋上的小岛。
They were so tranquil and clear that Olle thought he saw a bird drowning in one, when it was actually the reflection of a gull gliding above the surface.
它们是那么平静那么清澈，以至于 Olle以为自己看见一只鸟正沉入水中，其实那是一只正在滑翔的海鸥在水中的倒影。
In a broken-wing display, the bird spreads and drags the wings or its tail, and while it does that, it slowly moves away from the nests.
在一次折翼展示中，鸟展开并拖动它的翅膀或尾巴，一边拖，一边慢慢远离巢穴。
She held the bird gently in cupped hands.
她双手轻轻地捧着那只小鸟。
Another temporary discount may not be what you want, but at least it is a bird in the hand.
再一次临时打折可能达不到你所希望的，但至少这是已经到手的东西。
One day he caught a little bird and held it in his hands without anybody seeing it.
一天，他抓了一只小鸟，拿在手里，没有人看见。
A male bird of paradise may put himself in the limelight by displaying his spectacular plumage in the best stage setting to attract a female.
一只雄性天堂鸟可能会在最佳的场合中展示他华美的羽毛使自己成为关注的焦点，从而吸引雌性。
In front of the door he observed a bird which had caught itself in the thicket.
在门前，他看见了一只鸟被困在灌木丛中。
The little bird no more looked for happiness because it had seen the true happiness is not in the faraway place but in your own heart.
小鸟不再去寻找幸福，因为它已经看到了真正的幸福不是在遥远的地方，而是在你自己的心里。
The weaver bird builds a nest that looks like a basket, the nest shaped like a pear with a hole in the middle.
织巢鸟筑了一个篮子一样的巢，巢的形状像一个梨，中间有一个洞。
They were holding what looked like ropes that led, via some kind of mechanical system, to a giant bird in the sky.
他们拿着一些看起来像绳子的东西，这些“绳索”通过一些机械系统，延伸向天空中的一只“巨鸟”。
They were holding what looked like ropes that led, via some kind of mechanical system, to a giant bird in the sky.
他们拿着一些看起来像绳子的东西，这些“绳索”通过一些机械系统，延伸向天空中的一只“巨鸟”。
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