名词
中文翻译：锅炉
同义词：
['shell-type boiler', 'shell-fired boiler']
例句：
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1. Thenew shell boiler has significantly improved the efficiency of the heating system.
新型的壳式锅炉显著提高了供热系统的能效。
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2.In this case, the shell boiler is a more cost-effective solution than other types of boilers.
在这种情况下，壳式锅炉比其他类型的锅炉更经济实惠。
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3.The shell boiler design ensures that the heat is distributed evenly throughout the entire space.
这种壳式锅炉设计确保了热量在整个空间内均匀分布。