求翻译：其关键技术是高温高压、空间狭小、复杂电磁环境下，井下激励源的设计，是什么意思？

The key technology is the high temperature and pressure, the space is small, complex electromagnetic environment, the design of underground excitation source,

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Its key technologies is the high temperature high pressure, the space narrow and small, under the complex electromagnetic environment, mine shaft drive source design,

Its only a few key technology is the high temperature and high pressure, space, under complex electromagnetic environment, design of down-hole excitation source,

Its key technology is under high-temperature high pressure, narrow and small, complicated electromagnetic environment of space, encourage the design of the source in the pit,