Jokes are a difficult area.

笑话是一个很困难的领域。

youdao

Image segmentation is one of the classic problem and difficult area of digital image processing.

图像分割是图像处理领域中的一个经典问题也是一个难题。

youdao

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。

youdao

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