dragonfly

简明释义

英[ˈdræɡənflaɪ]美[ˈdræɡənflaɪ]

n. 蜻蜓

复 数 d r a g o n f l i e s

英英释义

单词用法

同义词

反义词

例句

1.It looks like a blue dragonfly.

它看上去像只蓝色蜻蜓。

2.The dragonfly feeds on flies.

蜻蜓以苍蝇为食。

3.The dragonfly became a dragon in his dream.

在他的梦中，那只蜻蜓变成了一条龙。

4.The small dragonfly was still there.

那只小蜻蜓仍然在那里。

5.How fast the dragonfly flies!

那只蜻蜓飞得真快啊！

6.They caught a dragonfly and watched its wings carefully.

他们抓了一只蜻蜓，并仔细观察它的翅膀。

7.A dragonfly with light wings flew by.

一只有着轻薄翅膀的蜻蜓飞过。

8.I saw a beautiful dragonfly hovering over the pond.

我看到一只美丽的蜻蜓在池塘上空盘旋。

9.The dragonfly is known for its incredible flying skills.

这只蜻蜓因其惊人的飞行技巧而闻名。

10.In summer, many dragonflies can be seen near the water.

夏天，许多蜻蜓可以在水边看到。

11.Did you know that a dragonfly can live for several years underwater?

你知道吗，一只蜻蜓可以在水下生活好几年吗？

12.The bright colors of the dragonfly make it easy to spot.

这只蜻蜓的鲜艳颜色使它很容易被发现。

作文

The beauty of nature is often reflected in the delicate creatures that inhabit our world. One such creature is the dragonfly, a fascinating insect known for its vibrant colors and remarkable flying abilities. With over 5,000 species worldwide, dragonflies are not only beautiful but also play a crucial role in the ecosystem. They are voracious predators, feeding on mosquitoes and other small insects, which helps to control pest populations. In this essay, I will explore the life cycle, characteristics, and ecological importance of the dragonfly.

To begin with, the life cycle of a dragonfly is quite unique. It starts with the laying of eggs in or near water bodies, such as ponds, lakes, and streams. The eggs hatch into nymphs, which live underwater for several months to several years, depending on the species. During this stage, they are fierce hunters, preying on aquatic insects and even small fish. Once they mature, the nymphs undergo a metamorphosis, emerging from the water as adults. This transformation is quite dramatic; the adult dragonfly expands its wings and takes its first flight, showcasing its incredible agility and speed.

Adult dragonflies are known for their striking appearance. They have large, multifaceted eyes that provide them with nearly 360-degree vision, allowing them to spot prey and avoid predators. Their bodies are long and slender, often adorned with brilliant colors ranging from iridescent blues and greens to bright yellows and reds. These colors not only serve to attract mates but also to camouflage them against predators. Additionally, dragonflies possess two pairs of wings that can move independently, enabling them to fly in any direction, hover in place, and even fly backward.

Ecologically, dragonflies are vital indicators of environmental health. Their presence in an ecosystem signifies clean water and a balanced environment. Since they are sensitive to pollution, a decline in dragonfly populations often points to deteriorating water quality. Moreover, they contribute significantly to the food web, serving as prey for birds, fish, and other larger insects. By controlling mosquito populations, dragonflies also help reduce the spread of diseases that these pests carry.

In conclusion, the dragonfly is much more than just a beautiful insect. Its life cycle, remarkable flying abilities, and ecological significance make it an essential part of our natural world. As we continue to face environmental challenges, preserving habitats where dragonflies thrive becomes increasingly important. By protecting these remarkable creatures, we are also safeguarding the health of our ecosystems. So next time you see a dragonfly flitting gracefully over a pond, take a moment to appreciate the intricate role it plays in maintaining the balance of nature.

自然的美丽常常体现在栖息在我们世界中的精致生物中。其中一种生物是蜻蜓，这是一种以其鲜艳的颜色和卓越的飞行能力而闻名的迷人昆虫。全球有超过5000种蜻蜓，它们不仅美丽，而且在生态系统中发挥着重要作用。它们是贪婪的捕食者，以蚊子和其他小昆虫为食，帮助控制害虫数量。在这篇文章中，我将探讨蜻蜓的生命周期、特征和生态重要性。

首先，蜻蜓的生命周期非常独特。它始于在水体（如池塘、湖泊和溪流）中或附近产卵。卵孵化成若虫，若虫在水下生活几个月到几年，具体取决于物种。在这一阶段，它们是凶猛的猎手，以水生昆虫甚至小鱼为食。一旦成熟，若虫经历变态，从水中出现，成为成虫。这一转变相当戏剧性；成虫的蜻蜓展开翅膀，开始第一次飞行，展示其令人难以置信的灵活性和速度。

成虫的蜻蜓以其引人注目的外观而闻名。它们拥有大型复眼，提供近360度的视野，使它们能够发现猎物并避免捕食者。它们的身体细长而纤细，通常装饰着从闪光的蓝色和绿色到明亮的黄色和红色的华丽颜色。这些颜色不仅用于吸引配偶，还用于在捕食者面前伪装。此外，蜻蜓拥有两对可以独立移动的翅膀，使它们能够向任何方向飞行、悬停在原地，甚至向后飞行。

在生态上，蜻蜓是环境健康的重要指示器。它们在生态系统中的存在意味着水质清洁和环境平衡。由于它们对污染敏感，蜻蜓数量的下降往往表明水质恶化。此外，它们在食物链中也发挥着重要作用，成为鸟类、鱼类和其他大型昆虫的猎物。通过控制蚊子数量，蜻蜓还帮助减少这些害虫传播的疾病。

总之，蜻蜓不仅仅是一种美丽的昆虫。它的生命周期、卓越的飞行能力和生态重要性使其成为我们自然界中不可或缺的一部分。随着我们继续面临环境挑战，保护蜻蜓繁衍生息的栖息地变得越来越重要。通过保护这些非凡的生物，我们也在维护生态系统的健康。因此，下次你看到一只蜻蜓在池塘上优雅地飞舞时，请花点时间欣赏它在维持自然平衡中所扮演的复杂角色。