但是，它们无法像电力加热器一般保持水温。
These do not tend to keep the water as warm as electric heaters, however.
运送瓶子，保持水温冷却都需要燃烧固体燃料增加温室气体。
Transporting the bottles and keeping them cold also burns fossil fuels, which give off greenhouse gases.
低温水洗——如果不得不机洗的话，保持水温在30度左右。
Keep it Cool - If you must use a washing machine, keep it to 30 degrees.
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