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。
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。
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。
Engineering seismic investigation in city is limited by ground and conditions of seismic environment it is worked very difficult.
城市工程地震勘察因场地及地震环境条件的限制，其施工难度大。
One of the few Echeverias growing in arid conditions on flat ground. It is difficult to maintain in cultivation.
此种生长在近乎干旱的平地上，这在石莲中不太常见。在园艺条件下营造类似生长环境不太容易。
One of the few Echeverias growing in arid conditions on flat ground. It is difficult to maintain in cultivation.
此种生长在近乎干旱的平地上，这在石莲中不太常见。在园艺条件下营造类似生长环境不太容易。
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