As is known to all, using clean energy plays an important role in pollution reduction.

众所周知，使用清洁能源在减少污染方面发挥着重要作用。

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Still, exercise's supporting role in weight reduction is vital.

然而，运动在减肥中的辅助作用是至关重要的。

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According to the newly revised Clean Air Act, emission permits have finally been granted legal status and will play an instrumental role in assigning reduction responsibilities and in enforcement.

根据最新修订的《空气清洁条例》，排放许可可最终赋予了法律地位，并在指定和执行减排义务中起指导性作用。

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Sadly, the council has been compliant and played their role in the reduction of crucial services, imposing a council tax freeze for a fourth year instead trying to maintain the once 'excellent' rated services it provided.

BBC: Somerset County Council: Union fear over job cuts plans

As the number two Republican in the Senate, he made the tough choices necessary to close deficits and he played an important role in bipartisan deficit reduction agreements.

WHITEHOUSE: Encouraging Long-Term Fiscal Responsibility and Reform

The WHO will set up a high-level group of external advisors on the role of health in poverty reduction.

BBC: WHO launches anti-poverty drive