noun🔗Share卵生哺乳动物 A mammal that lays eggs and has a single urogenital and digestive orifice. Only the echidnas and platypuses are included in this group"While most mammals give birth to live young, the monotreme is unique because it lays eggs, like the platypus found in Australia. "虽然大多数哺乳动物都直接生育幼崽，但鸭嘴兽和针鼹这类卵生哺乳动物 (luǎnshēng bǔrǔ dòngwù) 非常特别，因为它们像澳大利亚的鸭嘴兽一样，是产卵的。animalbiologyorganismnaturephysiologyChat with AIVocabulary GamePractice Reading
adjective🔗Share单孔的 (of a pollen grain) Having a single trema, or aperture."The botanist noted the pollen grain's monotreme structure under the microscope, making it easily identifiable. "在显微镜下，植物学家注意到这种花粉粒的单孔结构，这使其很容易被识别。biologyplantChat with AIVocabulary GamePractice Reading
