He was too out of condition to clamber over the top.他体质太差，爬不到山顶。Sailor as he was, it was easy enough for him to clamber up the gnarled trunk.他虽说是个水手,攀上这扭曲的树干, 倒还容易.Teenage boys clamber down mine shafts 30 to 50 meters de...
Most babies have a closed ductus arteriosus by 72 hours after birth.大多数婴儿在出生后72小时内动脉导管闭合.Methods: Umbilical vein, ductus venosus and venous ligament and ligamentum teres hepatis anatomized, observed and measured.方法: 解剖观测...