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。

youdao

I enjoyed playing in the centre of defence at such a difficult ground after playing at full-back in Brussels.

我在中后卫的位置上感觉很好，这要比在布鲁塞尔踢右后卫好多了。

youdao

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。

youdao

This makes it more difficult for the body to effectively use the same amount of oxygen as it would on the ground.

VOA: special.2009.07.14

We slept on the hard ground, ate canned beans from cold metal plates and spent our days in the difficult search for gold.

VOA: special.2009.07.04

"There is a difficult situation on the ground in Pakistan.

VOA: standard.2009.03.11

Beyond the opponents, surprises always come up south of the border for the U.S. This day it was a field with grass as long as the first cut on a golf course, which made hitting crisp passes across the ground difficult.

WSJ: U.S. Soccer: Americans Hexed in Cup Qualifier

How far (if at all) there is now a rift between Salahuddin and the Pakistan-based leadership and Dar and his commanders on the ground is difficult to gauge.

CNN: From Our Correspondent: Peace Deferred

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

FORBES: Fiscal Cliff Should Help Obama And Paul Ryan Find Common Ground On Budget