An appropriate - size tube is chosen to fit the trachea.选用与气管大小相仿的管子.The trachea in some patients is difficult or impossible to intubate under any circumstances.有的病人的气管在任何情况下都是很难、或根本不可能插管的.Conclusion Saber sheath trachea...
The hunters ranged through the dense tropical forests.猎人在茂密的热带森林中搜索。Their sleek , unmarred pelts are prime quarry for seal hunters.它们的一身光顺完好的毛皮,是海豹猎人们的首要目标.The hunters lured the bears on to certain death.猎人引诱那些熊送死.The re...