dorsal fin

简明释义

空气垂直舵稳定器

英英释义

例句

1.The dorsal fin of the dolphin was visible as it swam gracefully through the waves.

当海豚优雅地穿过波浪时，它的背鳍清晰可见。

2.During our boat tour, we spotted a whale with a large dorsal fin breaching the water.

在我们的船上游览中，我们看到一只鲸鱼跃出水面，露出了它巨大的背鳍。

3.A damaged dorsal fin can indicate that a fish has been in a struggle or an accident.

受损的背鳍可能表明鱼类经历过挣扎或事故。

4.The shark's dorsal fin is a key feature that helps identify its species.

鲨鱼的背鳍是帮助识别其种类的一个关键特征。

5.Scientists study the shape of the dorsal fin to understand the health of fish populations.

科学家研究背鳍的形状以了解鱼类种群的健康状况。

作文

The ocean is a vast and mysterious place, home to countless species of marine life. Among these creatures, some of the most fascinating are those that possess a prominent feature known as the dorsal fin. The dorsal fin is a fin located on the back of many fish and marine mammals, playing a crucial role in their movement and stability in the water. This unique adaptation allows these animals to navigate through their aquatic environment with grace and efficiency.One of the most well-known examples of a creature with a dorsal fin is the shark. Sharks are often recognized by their sleek bodies and intimidating presence, but it is their dorsal fin that serves as a key identifier. The dorsal fin of a shark can vary in size and shape depending on the species, but it is typically tall and triangular. This fin not only helps sharks maintain balance while swimming but also acts as a stabilizer, preventing them from rolling over. When a shark is spotted at the surface of the water, it is often the dorsal fin that gives away its presence, creating an unmistakable silhouette against the waves.In addition to sharks, many other fish species also possess dorsal fins. For instance, tuna and swordfish have streamlined bodies with dorsal fins that aid in their rapid swimming. These fins allow them to make quick turns and swift movements, which are essential for escaping predators or catching prey. The dorsal fin can also play a role in communication among fish, as some species use their fins to display dominance or attract mates.Marine mammals, such as dolphins and whales, also have dorsal fins. In these animals, the dorsal fin serves similar purposes, providing stability and aiding in navigation. For example, the dorsal fin of a dolphin can be quite pronounced, often curving backward. This characteristic helps scientists identify different species of dolphins in the wild. Furthermore, the shape and size of the dorsal fin can vary significantly between species, providing clues about their evolutionary adaptations.The study of dorsal fins extends beyond mere observation; it has practical implications as well. Marine biologists often monitor the health and behavior of fish populations by observing their dorsal fins. Changes in the size or shape of these fins can indicate environmental stress or changes in the ecosystem. For instance, if a population of fish is experiencing overfishing or habitat loss, their dorsal fins may become smaller or deformed, signaling a decline in their overall health.In conclusion, the dorsal fin is more than just a physical feature; it is an essential component of the survival and behavior of many aquatic species. From sharks to dolphins, the dorsal fin plays a vital role in their ability to thrive in the ocean. As we continue to explore and understand the complexities of marine life, the significance of the dorsal fin will undoubtedly remain a focal point of research and conservation efforts. Protecting the habitats where these magnificent creatures live is crucial, as it ensures that future generations will continue to marvel at the beauty and diversity of life beneath the waves.

海洋是一个广阔而神秘的地方，栖息着无数种海洋生物。在这些生物中，一些最迷人的生物拥有一个显著特征，称为dorsal fin。dorsal fin是位于许多鱼类和海洋哺乳动物背部的鳍，在它们在水中的运动和稳定性中发挥着至关重要的作用。这种独特的适应性使这些动物能够优雅而高效地在其水域环境中导航。鲨鱼是拥有dorsal fin的生物中最著名的例子之一。鲨鱼通常以其流线型的身体和令人畏惧的存在而闻名，但正是它们的dorsal fin使其成为关键标识。鲨鱼的dorsal fin根据物种的不同，大小和形状各异，但通常是高而三角形的。这种鳍不仅帮助鲨鱼在游泳时保持平衡，还充当稳定器，防止它们翻滚。当鲨鱼在水面被发现时，通常是dorsal fin暴露在外，形成在波浪中的明显轮廓。除了鲨鱼，许多其他鱼类也拥有dorsal fins。例如，金枪鱼和剑鱼具有流线型的身体，其dorsal fins有助于快速游动。这些鳍使它们能够迅速转弯和快速移动，这对逃避捕食者或捕捉猎物至关重要。dorsal fin在鱼类之间的沟通中也可能发挥作用，因为一些物种利用它们的鳍来展示优势或吸引配偶。海洋哺乳动物，如海豚和鲸鱼，也有dorsal fins。在这些动物中，dorsal fin具有类似的目的，提供稳定性并帮助导航。例如，海豚的dorsal fin通常非常突出，往往向后弯曲。这一特征帮助科学家在野外识别不同的海豚物种。此外，dorsal fin的形状和大小在物种之间可能有显著差异，为它们的进化适应提供线索。对dorsal fins的研究不仅限于观察；它也具有实际意义。海洋生物学家常常通过观察鱼类的dorsal fins来监测鱼群的健康和行为。这些鳍的大小或形状变化可能表明环境压力或生态系统的变化。例如，如果一群鱼经历过度捕捞或栖息地丧失，它们的dorsal fins可能会变小或畸形，表明它们整体健康状况的下降。总之，dorsal fin不仅仅是一个物理特征；它是许多水生物种生存和行为的重要组成部分。从鲨鱼到海豚，dorsal fin在它们在海洋中生存能力中发挥着至关重要的作用。随着我们继续探索和理解海洋生命的复杂性，dorsal fin的重要性无疑将继续成为研究和保护工作的重点。保护这些壮丽生物栖息的栖息地至关重要，因为这确保了未来几代人能够继续惊叹于波涛下生命的美丽和多样性。