He is also experienced in soft ground tunnelling using tunnel Boring Machine and NATM methods carried out in difficult ground conditions and at close proximity to important structures.

经历过使用盾构机进行软土掘进和在困难地层及靠近重要构筑物条件下使用新奥法。

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The method described in this paper has better suitability, especially has certain reference value for constructing Bridges under the difficult conditions, such as with weak ground, etc.

文中所述方法有比较好的适应性，尤其是对在较弱地基等困难条件下的桥梁施工有一定的参考价值。

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The environment perception technology is the difficult problem for Unmaned Ground Vehicles navigation, especially under off-road conditions.

无人驾驶车在越野条件下的环境感知技术是其实现自主导航功能的难题。

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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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