The war on coal is a war on the American worker.
In mathematics, you don't understand things. You just get used to them.
乳制品行业关系到国民健康,我们必须以最高的标准要求自己。
农业效率不仅仅关乎产量;它还涉及资源的负责任使用。
时间旅行是世界上最令人沮丧的事情。你无法改变任何事情,也无法阻止任何事情的发生。