送交者: Hoffman 于 2010-05-19, 15:58:01:

回答: 人在水底用管子呼吸有出血危险，憋气或者用空气瓶就没问题了？ 由 tinaliang 于 2010-05-19, 15:33:35:

• good question. suppose we have a exhale valve at mouth. (无内容) - tinaliang (0 bytes) 2010-05-19, 16:03:47 (443457)

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