coal-burning boiler operated by handwork
... outer pre-stressed reinforcement 体外预应力加固 coal-burning boiler operated by handwork 燃煤手烧炉 combinatorial method 组合法 ...
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coal-burning boiler operated by handwork
手工操作的燃煤锅炉
以上为机器翻译结果，长、整句建议使用 人工翻译 。