"Bilateral symmetry"是指生物体在左右两侧具有均匀、对称的特点。这种对称性通常表现在生物体的形态、结构、功能等方面，是许多生物的基本特征之一。
以下是一篇关于bilateral symmetry的英文范文：
Bilateral Symmetry: The Basics and Its Evolutionary Significance
Bilateral symmetry is a fundamental feature of many living organisms, particularly those in the animal kingdom. It refers to the even distribution of features on either side of an organism, resulting in a symmetrical appearance. This symmetry is not only aesthetic, but also serves important functions in the organism's biology.
The most basic definition of bilateral symmetry involves the presence of two equal halves, each with their own set of organs and tissues. These halves are connected by a central axis, allowing the organism to rotate and bend in response to stimuli. Bilateral symmetry is seen in many insects, worms, and other invertebrates, as well as some fish and amphibians.
However, the concept of bilateral symmetry extends beyond the physical structure of an organism. It also refers to the way in which an organism's internal organs and systems are organized. For example, bilateral symmetry implies that there is a central coordination system that regulates the activities of the various organs and tissues. This coordination system ensures that the organism's responses are coordinated and efficient, enabling it to adapt to its environment.
The evolution of bilateral symmetry has been linked to several important factors, including the development of complex nervous systems and the emergence of advanced cognitive abilities. It has also been proposed that bilateral symmetry facilitated the evolution of bipedalism, allowing some organisms to move on two legs instead of four. This change in locomotion has had profound effects on the evolution of many species, including humans.
In summary, bilateral symmetry refers to the even distribution of features on either side of an organism, resulting in a symmetrical appearance. It serves important functions in an organism's biology, including coordination and efficiency, and has been linked to the evolution of complex cognitive abilities and bipedalism.
bilateral symmetry是指两侧对称，是一种生物学名词，描述生物体（如昆虫、鱼类等）的内部和外部形态都是两两相对称的情况。
在英文范文当中，bilateral symmetry可能会被用来描述某种特定的生物结构、器官分布或者生物形态特征。例如，“昆虫的身体具有明显的bilateral symmetry（两侧对称）”，或者“这种设计的bilateral symmetry使得其在水中的游泳效率更高”。
bilateral symmetry的意思是两侧对称。
在英文范文里，这个词常用于描述生物的形态，如动物或植物的形态特征。双侧对称意味着一个物体的两侧在中央线处是对称的，且这种对称性通常是通过扭转、折叠等生物过程来实现的。