1. The research on forests and climate change relies heavily on data collection, which poses a difficult task for scientists.
2. The Copenhagen Consensus project carries out the difficult task of comparing one set of initiatives with another by using fundamental economic tools and principles.
3. difficult task
3. How to effectively create a cleaner cyberspace remains a difficult task for the authorities.
4. All public security officers and prosecutors are facing the difficult task of bringing most organized criminal gangs and criminals to justice.
5. Without a crystal ball, it's always a difficult task to forecast the future oil price.
6. How to shield young people from Internet porn is an increasingly difficult task.
7. But the fragile ecology provides the water resources for a significant part of China and the task of keeping it pristine is becoming increasingly difficult.
8. " The task is complicated by the difficult external environment, " He and Zhang said in a statement.
9. But enforcing the law was a difficult task for lack of concrete supporting measures.
10. Gauging market trends is a most difficult task and one that analysts are trying to perfect.