It is of course very useful for a migrating bird to be able to switch to a magnetic compass when clouds cover the sun; otherwise it would just have to land and wait for the sun to come out again.

When the boss discovered that the clerk used to be a jail bird he dismissed him at once.

上司发现那位职员以前曾是囚犯，就立即把他解雇了。

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He was a jail bird, and naturally it was difficult of him to find work after leaving prison.

他蹲过监狱，出狱后自然不容易找到工作。

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The Bird Nest is so beautiful that many foreigners have come to visit it.

鸟巢太漂亮了，以至于很多外国人都来参观。

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The observation of the bird nest type nursing using in the low birth weight premature infant

鸟巢式护理应用于低出生体重早产儿的观察

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Weaving "Bird Nest" Carefully with Modern Hoisting Technology

以现代吊装技术精心编织鸟巢&大型吊装案例之一

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May: You know, the Bird Nest is just not far from here.

阿美：鸟巢就离这里不远。

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Had the French inventor tried to model his plane on every detail of a bird's wing, he would not have succeeded in flying it.

要是那个法国发明家力图模仿鸟翼的每个细节来造他的飞机的话，他就不会使它飞起来。

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A bird's wing waves above a trap set for lynx in British Columbia, Canada.

一只鸟的翅膀波动在一个陷阱之上，放置它是因为猞猁在英属哥伦比亚，加拿大。

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Tuft of small stiff feathers on the first digit of a bird's wing.

一丛小而硬的羽毛，长在鸟翼的第一个骨节处。

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One of the main flight feathers projecting along the outer edge of a bird's wing.

突出在鸟翼外边缘的一种主要的飞羽。开发地区边缘很快会有国外资金投入。

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The main work is as follows: Firstly, embarking from the structure of insect and bird wing, this paper analyzed the flight mode, the flight theory and the flapping-wing motion pattern of two kind of flights biology.

主要研究内容包括：首先，从昆虫和鸟类翅膀构造出发，分析两类飞行生物的飞行方式、飞行原理和翅膀的扑动模式为扑翼微型飞行器设计提供理论和仿生学依据。

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And the trailing edge has a flexible fringe, unlike the rigid trailing edge of a conventional bird wing.

而接下去的尾端则是一小段柔韧的弯曲，不像是一般的羽翼末端那样坚硬。

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To the ancient Mayans of CentralAmerica the bird was Moan, a bird of ill omen and death.

对中美洲的古代玛雅人来说，热带大雕就是Moan，一种带来不祥和死亡的鸟。

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Douglas told us that he had witnessed another motorway crash; he seems to be a bird of ill omen.

道格拉斯告诉我，他又目睹了一桩快车道撞车事件；他似乎总是报凶讯。

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Although I was not a bird watcher, my first glimpse of the adorable puffin won me over.

尽管我不是一名观察研究野鸟的学者，但是当我第一眼看到那可爱的海鹦，就被它迷住了。

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Teddy: well you know he's a keen bird watcher do not you?

泰迪：他热中观察野鸟，这是你知道的吧？

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The bird watcher has been looking for the first robin to appear in the spring.

这位鸟类观察者一直在寻找出现在春天里的第一只知更鸟。

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Rachel Carson was a scientist and a bird watcher.

拉琪尔•卡森是一位科学家兼鸟类观察家。

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Relationship between Total Phenol in White Birch Wood and Wood Rot Fungi

白桦木材中总酚含量与抗木材腐朽菌的关系

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Regularity of Juice Flowed from Asian White Birch and Its Composition Analysis

桦树汁液的外溢规律及其成分分析

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