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About 生活百科知识大全

*****传播知识、普及科学上知天文下知地理百科知识大全本应用给力推荐
-----《百科知识大全-健康/动物/军事/人体/天文/地理/信息/科技》
-----内容丰富涵盖了：营养健康、动物世界，军事交通，人体的奥秘，天文地理，信息科，技你身边的科技等方面；
=====举例：
为什么乘地铁时耳朵不发胀
列车驶入隧道后，人的耳朵往往会发胀，这与坐索道车或乘公共汽车上高山，或乘飞机起飞、着陆时的感觉相似。
人们所以会产生这种感觉，是由于空气压力的急剧增加或降低所造成的。
高速飞驰的列车驶入隧道，隧道内的空气受到挤压，气压便会增高，接着便压迫了耳朵里的鼓膜，使人感到耳朵发胀。
而在地铁里，由于人的身体始终都是处在一定空气的压力中，即使电车飞驰着，也不足以引起空气压力的变化，所以耳朵没有什么感觉。
尽管如此，如果你稍加注意，会发现当地铁电车紧急刹车时，耳朵同样会感到发胀。