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1.footprint n.脚印
Perhaps you're trying to reduce your carbon footprint.
或许你是要减少你的碳足迹。
2.circle n.圆圈
The economy is stuck in a vicious circle.
国家的经济陷入了一个死循环。
3.revenue n.岁入，税收
Revenue at both yahoo and aol is steadily falling.
雅虎与美国在线的年收益也呈稳步下降趋势。
4.pile v.堆起；堆叠；放置
A worker throws a computer casing onto a pile.
一个工人将一个电脑外套扔到一个废物堆上。
5.investment n.投资，投资额；封锁
Trade and investment will be hurt.
贸易和投资将受到影响。
