noun🔗Share正中面, 中间面 (rare outside entomology) The mesial plane dividing the body into similar right and left halves."The surgeon carefully marked the patient's abdomen along the meson before making the incision, ensuring symmetrical access for the procedure. "外科医生在切开病人腹部之前，仔细地沿着正中面标记，以确保手术过程中能对称地进行操作。anatomybodybiologyinsectChat with AIVocabulary GamePractice Reading
noun🔗Share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.)"Physicists study mesons to understand the forces that hold the nucleus of an atom together. "物理学家研究介子，是为了了解将原子核束缚在一起的力。physicsmassChat 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.)"Physicists study the properties of a meson, a type of particle made of a quark and an antiquark. "物理学家研究介子的性质，介子是一种由夸克和反夸克组成的粒子。physicselementChat with AIVocabulary GamePractice Reading
