What would be the environmental impact of switching to single-dose vials only?
转为仅采用单剂瓶会对环境造成什么影响？
The environmental cost of replacing all multi-dose vials with single-dose vials must be taken into consideration.
必须将以单剂瓶取代所有多剂量瓶的环境成本考虑在内。
There would also be environmental costs if all multi-dose vials were replaced with single-dose vials.
如果多剂量瓶被单剂量瓶取代，还将带来环境代价。
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