严重缺氧 meaning in English

severe depletion of oxygen

The 71 glacier is 4 , 600 meters above sea level and people normally develop the high altitude syndrome when climbing it , because of the severe lack of oxygen at this elevation
七一冰川的海拨高度是4600公尺，一般人去到那里，几乎都会因为严重缺氧而发生高原反应。
These freshwater fish , generally inhabitants of the lakes and rivers of europe and asia , are able to change the structure of their gills to boost oxygen uptake , allowing them to survive when they are for all practical purposes starved of oxygen
的淡水鱼，一般生活在亚洲和欧洲的湖河中。它们可以改变鱼腮结构来提高对氧气的吸收，以便在严重缺氧时保住性命。
Of the 29 red tide incidents recorded this year , all but one were formed by non - toxic species . as all these red tides receded within a short time , they had not caused any serious oxygen depletion in seawater and thus should not have caused significant impact on the marine resources and ecology
（二）在今年录得的二十九宗红潮中，除了一宗是由有毒品种组成外，其馀均为无毒品种，而所有红潮亦在短时间内消退，并没有引致海水出现严重缺氧的情况，相信不会对海洋资源及环境生态造成大的影响。