The bill of the Toco Toucan makes up about one-third of its body length and ornithologists have long wondered about the purpose for appendage.
托科巨嘴鸟的喙大约占到体长的三分之一，鸟类学家很久以来对于不清楚这部分的目的。
Percutaneous transcatheter left atrial appendage exclusion embolism complications can be prevented and to avoid long-term oral anticoagulation drugs.
经皮左心耳堵闭术可以预防血栓栓塞并发症、并避免长期应用抗凝药物。
Percutaneous transcatheter left atrial appendage exclusion embolism complications can be prevented and to avoid long-term oral anticoagulation drugs.
经皮左心耳堵闭术可以预防血栓栓塞并发症、并避免长期应用抗凝药物。
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