In Britain this is provided through a mechanism called the Renewables Obligation, which requires those who sell electricity to buy an increasing amount of it from renewable sources.

在英国，补贴是通过一个称为可再生能源义务法令来执行的，该法令要求供电商必须购买数量不断增加的可再生资源电力。

youdao

Pettitte was making an extraordinarily large amount of money and felt a tremendous obligation to do everything that he could to return to the Yankees in an expeditious manner.

FORBES: A Fond Farewell To Yankee Stalwart Andy Pettitte

Major fashion brands also have an obligation to dramatically reduce the amount of water and energy used and waste emitted in making and selling their clothes, as well as to offer consumers more stylish products that are made out of recycled and eco-friendly materials.

CNN: The fashionista's dilemma: Cheap clothes