Definitions

[1] v. 两倍,快步走,加倍努力

[2] vbl. 两倍,快步走,加倍努力

1. By the year 2020, the population of our city will have doubled.
   在2020年以前，我們的城市的人口將增加一倍。
2. The population has doubled in the last five years.
   在過去的五年裏人口增長了一倍。
3. Tom doubled his investment in a year.
   汤姆一年内增加了一倍的投资。
4. The number of officials doubled last year.
   去年官员的数量成倍增加了。
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