The automatic control level and heatefficient for coal heating boiler is lower for most of domestic boiler so far.
目前国内大部分燃煤采暖用锅炉房自动化控制水平普遍较低，热效率也不高。
2
However MIT's method to convert light and heat into electricity is much more efficient than previous versions.
然而，MIT将光和热转化为电力的方法比之前的版本要更有效。
3
That meant the destruction of vast grasslands, which released equally vast amounts of methane-a gas far more efficient at trapping heat than carbon dioxide is.