When the air temperature is very low level, the water vapor condensation in the air, is not it condenses into water droplets, but by the water vapor condenses into direct light snow film.

当天空上层的温度很低、空气中的水汽凝结时，它就不是凝结成水滴，而是由水汽直接凝结成小雪片。

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Solar water heater converts solar light energy into thermal energy and heats water from low temperature to high temperature so as to meet needs for hot water from peoples' life and production.

太阳能热水器是将太阳光能转化为热能，将水从低温加热到高温度，以满足人们在生活和生产中的热水需求。

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They will be closed only for short periods of time and only during the winter when the water temperature and light are too low for algal blooms.

ECONOMIST: Flood barriers