He knew that the sources of the red-stained grains were generally closer to the North Pole than were the places yielding a high proportion of "clean" grains.
他知道，这些红色颗粒的来源通常更靠近北极，而不是那些产生大量“干净”颗粒的地方。
We 'll take steps to meet the goal we set with Canada and Mexico to achieve 50 percent clean power across North America by 2025.
我们将采取措施来满足我们与加拿大和墨西哥制定目标，在2025年实现北美的50%的清洁能源比例。
Our school is in the north of our city. It is very big and clean.
我们的学校坐落在城市的北面，它很大而且非常干净。
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