一段时间以来，已知野水禽是所有A型流感病毒的自然宿主。
Wild waterfowl have been known for some time to be the natural reservoir of all influenza a viruses.
方法常规等中心定位并体表标出激光灯“十”字，旋转治疗床至照射野避开肩关节治疗颈段肿瘤。
Methods Isocentric localization in routine way and marking the laser cross in body surface and revolving the bed made radiation field avoiding the shoulder joint.
左先生到达一段残破的野长城上时，已经辨不清方向。
At left, a Broken wild on the Great Wall, already switch direction.
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