Natural gas is already the principal source of heat in half of American households.
天然气已经是美国大半家庭的主要热能来源。
The first half of the principal manuscript told a very particular tale.
基本手稿的第一部分讲了个奇怪的故事。
Rice is the principal food for over half of the population of the world.
水稻是最重要的粮食作物之一，是世界约一半以上人口的主要口粮。
Within less than half an hour, the principal business had been disposed of.
不到半个小时，一些主要的事情都已解决了。
Within less than half an hour, the principal business had been disposed of.
不到半个小时，一些主要的事情都已解决了。
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