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

VOA: special.2009.03.07

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

That is why it is hard to tell a powerful storm, Hurricane Andrew, caused severe damage to the area in nineteen ninety-two.

VOA: special.2009.06.30