the most primitive mammals comprising the only extant members of the subclass Prototheria
例句
Style:Slowcore/Lo-Fi, Label:Weewerk records in Canada, Monotreme records in Europe. 很喜欢主页的风格，还有主唱的声音，柔软，似深夜耳语。
Small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet,only species in the family Ornithorhynchidae. 澳大利亚和塔斯马尼亚的体毛浓密、水生小哺乳动物，嘴和尾宽阔，脚有蹼，鸭嘴兽科的唯一种类。
*A monotreme is a animal that lays eggs and suckles its young. * 单孔类动物是卵生哺乳性动物。
burrowing spine-covered monotreme of Australia having a long snout and claws for hunting ants and termites. 澳大利亚体表有刺的穴居单孔目动物，有长长的口鼻以及用于捕食蚂蚁和白蚁的爪。
burrowing spine-covered monotreme of Australia having a long snout and claws for hunting ants and termites 澳大利亚体表有刺的穴居单孔目动物，有长长的口鼻以及用于捕食蚂蚁和白蚁的爪
small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae. 澳大利亚和塔斯马尼亚的体毛浓密、水生小哺乳动物，嘴和尾宽阔，脚有蹼；鸭嘴兽科的唯一种类。
