noun🔗Share正中面，中央面 (rare outside entomology) The mesial plane dividing the body into similar right and left halves."Sentence: "When drawing a butterfly in biology class, the teacher emphasized that the mesons should be perfectly aligned to show bilateral symmetry." "画生物课上的蝴蝶时，老师强调正中面一定要对齐，这样才能体现出两侧对称。anatomybiologyorganismpartinsectChat with AIVocabulary GamePractice Reading
noun🔗Share介子，中介子 A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.)"Scientists study mesons to understand the strong force that holds the nucleus of an atom together. "科学家们研究介子，是为了理解将原子核结合在一起的强作用力。physicsmassscienceenergyelementChat with AIVocabulary GamePractice Reading
noun🔗Share介子 (now specifically) An elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Mesons composed of rarer quarks are much heavier.)"Scientists study mesons to better understand the fundamental forces that hold matter together. "科学家研究介子，以便更好地理解将物质结合在一起的基本力。physicsChat with AIVocabulary GamePractice Reading
