名词
中文翻译：十亿
同义词：
['trillion', 'quintillion']
例句：
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1. The population of the city is expected to grow by a giga in the next ten years.
预计该市的人口在接下来的十年里将增长一兆。
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2. The company's revenue has increased by a giga in the past year.
该公司的年收入在过去一年内增加了一兆。
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3. The world's population is expected to reach a giga by 2050.
预计到2050年全球人口将达到一兆。