Then,a hard cast may be put around the area of the break to hold the bone in place while it heals.

VOA: special.2009.02.04

I think that it makes it hard for that particular area of scientific research to go forward.

我想在这方面的科学研究很难推进。

生物克隆是热点问题 - SpeakingMax英语口语达人

They seem like the hard rock maple trees often found in that area, nothing can make them move.

VOA: special.2009.03.07

And he said the planned hard surface area had been reduced by 25%, but in other respects the application remained the same as that submitted in 2011.

BBC: Redhill Aerodrome in revised Surrey runway bid

It's not a hard hat area for nothing.

BBC: World's railway future born in Edinburgh test lab

It's hard to find area stops large enough to accommodate, say, 80 West Point cadets.

WSJ: Ever More Pointing, Talking: The Rise of New York City Tour Guides