请你利用所学的生物学知识分析回答下列问题1在飞机起飞或降落时有的乘客通常会咀嚼口香糖或不断做吞咽动作这样做的目的是使 张开以保持 Template




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tomski请你利用所学的生物学知识分析回答下列问题1在飞机起飞或降落时有的乘客通常会咀嚼口香糖或不断做吞咽动作这样做的目的是使 张开以保持 coloring