这是工具可能成为火花源或热源并点燃可燃物的又一类区域。
This is another area where the tool can be the source of the spark or heat causing ignition of flammable materials.
其中一个区域被发现有明显的热源，这意味着有大质量的恒星早已形成了。
One region revealed significant heating, indicating that massive new stars must have already formed.
利用经济分析方法，结合实际供热工程，对区域供热热源方案的技术性、经济性进行了分析比较。
The technicality and economy of heat source scheme of district heat-supply are analyzed and compared with a practical heat-supply scheme by economical analysis methods.
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