difficult ground conditions
difficult ground conditions
困难的地面条件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Right here on the flight line in crash landings, the helicopters landing in what are called brown-out conditions, meaning the dust on the desert floor rises up and engulfs the helicopter and it is very difficult for the pilot to see the ground in those conditions and very easy to mess up the landing.
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