在美国等国家，只有10%的青少年会每天花时间外出。
In countries such as the USA, only 10% of teenagers spend time outside every day.
来自澳大利亚、加拿大和美国等国家的科学证据清楚地表明，这种鸟类的数量下降了。
The scientific evidence from countries like Australia, Canada, and the USA clearly indicates a decline in the birds' numbers.
德国和美国等国家表达了对中国决定减少稀土出口的担忧。
Germany and the United States are among the countries that have expressed concern about China's decision to cut rare earth exports.
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