difficult ground

基本解释

For public health specialists this can be difficult ground.
对公共卫生专业人员而言，这可能是一个困难的方面。
But on the verge of exhaustion of the reserve the working reached other side of the property, where it experienced difficult ground movement.
但在准备金的枯竭的边缘工作达成的财产，对方在那里经历困难的地面运动。
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。

This makes it more difficult for the body to effectively use the same amount of oxygen as it would on the ground.
We slept on the hard ground, ate canned beans from cold metal plates and spent our days in the difficult search for gold.
"There is a difficult situation on the ground in Pakistan.

Given their inherent differences, in terms of both format and ideology, both plans are difficult to compare on level ground.
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