求翻译：如锅炉通过煤燃烧加热生产水蒸汽，按当前的材料技术水平(在超超临界的蒸汽电站中)工质温度为600~620℃；欧洲正在执行的AD700计划，即把蒸汽温度提高到700℃以提高发电效率(50~51%)，但由于锅炉、汽轮机材料及价格等问题，经十余年的联合攻关，至今仍未商业化。是什么意思？

The production of water vapor, such as the boiler through coal combustion heating at the current level of materials technology (ultra-supercritical steam power plant) working fluid temperature of 600 ~ 620 ° C; ad700 plan being implemented in Europe, the steam temperature to 700 ° C to improve power

If boiler heat production through coal combustion, and water vapor in the current technological standard materials (in an ultra-supercritical steam power plant) in the quality temperature is 600 to 620 °; the European C AD are being carried out in 700 plan to steam temperature rises to 700 degrees t

If boiler through coal burning heating production steam, according to current material technical level (in ultra supercritical steam power plant) working substance temperature for 600~620℃; Europe is carrying out the AD700 plan, namely enhances the vapor temperature to 700℃ enhances electricity gene

As boiler by coal combustion heating production steam, by current of material technology (in super super critical of steam power station in the) workers mass temperature for 600~620℃; European is implementation of AD700 plans, is to steam temperature improve to 700 ℃ to improve power efficiency (50~

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