alula

简明释义

英[ˈæljʊlə]美[ˈæljʊlə]

n. [鸟] 小翼羽

复 数 a l u l a e

英英释义

单词用法

同义词

反义词

例句

1.A tiny feathered "thumb," the alula, improves flight control. The protruding shaft on the first wing feather makes a loud, rustling sound—adding acoustics to the visual display.

微小的拇翼改善了对飞行的控制能力，第一翼羽上的凸出轴结构会发出沙沙的响声——在保持视觉效果的同时还增添了声学效果。

2.A tiny feathered "thumb," the alula, improves flight control. The protruding shaft on the first wing feather makes a loud, rustling sound-adding acoustics to the visual display.

微小的拇翼改善了对飞行的控制能力，第一翼羽上的凸出轴结构会发出沙沙的响声——在保持视觉效果的同时还增添了声学效果。

3.A tiny feathered "thumb," the alula, improves flight control. The protruding shaft on the first wing feather makes a loud, rustling sound-adding acoustics to the visual display.

微小的拇翼改善了对飞行的控制能力，第一翼羽上的凸出轴结构会发出沙沙的响声——在保持视觉效果的同时还增添了声学效果。

4.The alula 副翼 acts like a flap, increasing the surface area of the wing at lower speeds.

这个alula 副翼像一个襟翼，在低速时增加了机翼的表面积。

5.Birdwatchers often admire the beauty of the alula 副翼 in various species of birds.

鸟类观察者常常欣赏各种鸟类中alula 副翼的美丽。

6.The bird spread its wings, revealing the small alula 副翼 that helps it maneuver through tight spaces.

那只鸟展开翅膀，露出了小alula 副翼，帮助它在狭窄的空间中灵活飞行。

7.During the flight lesson, the instructor pointed out how the alula 副翼 affects the lift of the glider.

在飞行课上，教练指出了alula 副翼如何影响滑翔机的升力。

8.The design of the aircraft incorporates a similar principle to the alula 副翼 found in birds.

这架飞机的设计采用了与鸟类中发现的alula 副翼相似的原理。

作文

The term alula refers to a small, thumb-like projection on the wing of a bird, which plays a crucial role in flight mechanics. This unique anatomical feature is often overlooked, yet it is essential for birds' ability to maneuver and maintain stability during flight. The alula consists of one or two feathers attached to a small bone that can be raised or lowered independently of the primary wing feathers. This allows birds to control airflow over their wings, especially at slow speeds or during landing. In many ways, the alula is akin to an aircraft's flaps, which are used to increase lift and reduce stall speed. When a bird extends its alula, it creates turbulence that helps to keep the air flowing smoothly over the wings, thus enhancing lift. This is particularly important for species that require precise control during takeoff and landing, such as hawks and owls. Moreover, the alula can aid in rapid turns and complex aerial maneuvers. Birds like hummingbirds, which are capable of hovering and flying backward, rely heavily on their alula to adjust their flight path quickly. Without this small but mighty feature, many birds would struggle to perform the acrobatic feats that we often admire. The evolutionary significance of the alula cannot be understated. It is believed that the development of the alula allowed early birds to exploit new ecological niches by providing them with enhanced flight capabilities. This adaptation likely contributed to the diversification of avian species, enabling them to thrive in various environments. From forest canopies to open fields, the presence of the alula has undoubtedly played a role in the survival and success of birds throughout history. In conclusion, the alula is a remarkable example of nature's ingenuity. It highlights how even the smallest adaptations can have significant impacts on an organism's behavior and survival. As we continue to study avian biology, understanding the function and importance of the alula can provide insights into the evolution of flight and the incredible diversity of bird species we see today. Whether you are a birdwatcher, a biologist, or simply an admirer of nature, appreciating the alula can deepen your understanding of the complexities of flight and the marvels of evolution.

术语alula指的是鸟类翅膀上的一个小型、类似拇指的突出部分，它在飞行力学中起着至关重要的作用。这个独特的解剖特征常常被忽视，但它对于鸟类在飞行中的机动性和稳定性至关重要。alula由一根或两根羽毛组成，附着在一根小骨头上，可以独立于主要翅膀羽毛升起或降低。这使得鸟类能够控制气流在其翅膀上的流动，特别是在低速飞行或着陆时。在许多方面，alula类似于飞机的襟翼，用于增加升力和减少失速速度。当鸟类伸展其alula时，会产生湍流，帮助保持空气在翅膀上的平稳流动，从而增强升力。这对需要在起飞和着陆期间进行精确控制的物种尤为重要，例如鹰和猫头鹰。此外，alula可以帮助快速转弯和复杂的空中机动。像蜂鸟这样的鸟类能够悬停和倒退飞行，极大依赖于其alula来快速调整飞行路径。如果没有这个小而强大的特征，许多鸟类将难以执行我们常常钦佩的杂技动作。alula的进化意义不容小觑。人们认为，alula的发展使早期鸟类能够通过提供增强的飞行能力来利用新的生态位。这种适应性可能促成了鸟类物种的多样化，使它们能够在各种环境中繁荣。从森林树冠到开阔的田野，alula的存在无疑在鸟类的生存和成功中发挥了作用。总之，alula是自然智慧的一个显著例子。它突显了即使是最小的适应也能对生物的行为和生存产生重大影响。随着我们继续研究鸟类生物学，理解alula的功能和重要性可以为我们提供关于飞行进化和我们今天所见鸟类物种惊人多样性的洞察。无论你是鸟类观察者、生物学家，还是单纯的自然爱好者，欣赏alula都可以加深你对飞行复杂性和进化奇迹的理解。