Method: 40 curved mesial - buccal canals in mandibular molars were selected and divided into two groups randomly. 方法: 选取40个下颌磨牙近中颊侧弯曲根管,随机分为两组,每组20个根管.
Mummies of pleistocene ground sloths, with original skin, hair, tendons and claws have been found.还发现了保存原有皮肤, 毛发, 腱和爪的更新世时期地面树懒的木乃伊.He was inspired by fossils of armadillos and sloths.犰狳和树懒化石让他获得了灵感.Sloths live in trees ...