对于那些使用恒定的冰川融化的水作为饮用水的数百万人来说，冰川面积不断缩小是一个难题。
Shrinking glaciers are a problem for million is of people who use regular glacier melt for drinking water.
使用银离子作为航天饮用水的消毒剂，其含量直接影响航天饮水的卫生安全。
The content of silver ion affects directly on hygienic safety of drinking water for spaceflight when it is used as disinfectant.
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