n.(生物分类学的)门

原形：phylum复数：phyla

The animal kingdom is divided into several major phyla, such as Chordata and Arthropoda.
动物界被划分为几个主要的门，如脊索动物门和节肢动物门。
Invertebrates like insects belong to the phylum Arthropoda, characterized by their exoskeletons.
昆虫等无脊椎动物属于节肢动物门，以其外骨骼为特征。
The phylum Porifera, also known as sponges, are simple aquatic organisms.
棘皮动物门（如海绵）是简单的水生生物。
The annelids, including earthworms, form the phylum Annelida with their segmented bodies.
环节动物，如蚯蚓，属于环节动物门，它们的身体由许多段组成。
Phylum Platyhelminthes, or flatworms, have a distinct bilateral symmetry in their body plan.
扁形动物门（如扁虫）的身体结构具有明显的两侧对称性。
Many marine animals, like jellyfish, are part of the phylum Cnidaria, with stinging cells called cnidocytes.
许多海洋生物，如水母，属于刺细胞动物门，其细胞具有刺细胞。
Phylum Mollusca contains gastropods, such as snails and clams, known for their protective shells.
软体动物门包括腹足纲（如蜗牛和蛤蜊），它们以保护壳著称。
The phylum Echinodermata, which includes starfish and sea urchins, have a radial symmetry.
海星和海胆属于棘皮动物门，它们的身体呈辐射对称。
Some phyla, like the chordates, have a backbone, while others do not, like the invertebrates.
有些门，如脊索动物，有脊椎，而另一些，如无脊椎动物，没有。
The phyla of multicellular organisms evolved independently in the early history of life on Earth.
多细胞生物的各个门是在地球生命早期独立进化的。