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607 million—billion—trillion
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1704946683
million指百万（后面一般不加-s）：
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1704946685
The population of Scotland was nearly two million．苏格兰的人口近200万。
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1704946687
She made two million dollars in one year．她一年赚了200万美元。
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1704946689
在个别情况下可加-s：
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1704946691
Millions of lives have been saved．数以百万计的生命得救了。
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1704946693
His idea is worth millions．他的主意值多少百万。
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1704946695
billion现在都指“十亿”（通常不加-s）：
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1704946697
A human adult has about 100 billion cells．成人身体约有1000亿个细胞。
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1704946699
3 billion dollars 30亿美元
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1704946701
over 1.3 billion people 13亿多人
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1704946703
在个别情况下可加-s：
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1704946705
Their light has taken billions of years to reach us．它们的光线经过许多亿年才到达我们这里。
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1704946707
Biological system has been doing this for billions of years．生物系统这样做已经有多少亿年了。
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1704946709
He thought that it must be worth billions．他认为这准值几十亿。
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1704946711
过去在英国它曾表示1000000000000，但现在已经过时。
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1704946713
trillion表示1000000000000（1万亿）：
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1704946715
The central bank printed over 2 trillion roubles．中央银行印制了2万亿卢布。
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608 mind
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1704946720
mind可作名词，也可作动词。
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作名词时表示“脑子”、“心（思）”：
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An idea has just come to my mind．我脑子里刚想出一个主意。
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His mind was occupied with the future．他脑子里在想着未来。
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Her mind was not entirely on her work．她的心没完全在她工作上。
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