Jokes are a difficult area.

笑话是一个很困难的领域。

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Speed and reliability in travel search, especially around flights, is an extremely difficult area to master.

旅游搜索的速度和可靠性最难掌控，尤其是对于机票搜索。

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Northeast Asia is not only an important area in the regional cooperation in China, but also a difficult area.

东北亚地区既是中国开展区域经济合作的重点地区，也是难点地区。

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President Obama also spoke about the difficult time people in the Gulf area were going through as a result of the oil spill.

VOA: special.2010.06.18

They moved Eagle forward, away from a very rocky area that might have caused a difficult landing.

VOA: special.2009.07.15

Niagha region community leader Yorom Ballo says the situation is very difficult in his area.

VOA: standard.2009.10.05

Clearly there is a difficult area there - to be participating in the sport you are also regulating.

BBC: Cornelius Lysaght

Howlett said there was currently no set policy for ransoms, as it was a difficult area to deal with.

CNN: How to solve the pirate problem

It is clear that rules of the road are required in this difficult area, and not just for robots with wheels.

ECONOMIST: Robot ethics