i think they are more concerned with particles, which


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送交者: Enlighten 于 2008-08-06, 11:59:22:

回答: 你从医学生理角度去辩解是找错了路子 由 deadmeat 于 2008-08-06, 11:52:52:

can thicken the blood and reduces the circulation.

this statement "如果口罩和脸部完全密封的话人早憋死了" is totally wrong. air can pass through the fabric of the mask. the mask is meant to let filtered air to pass through. that's how it is designed.




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