Grammar Note
billion 可数；前有数词时单复数同形（two billion）；表示极大、不确定数量时用复数加 of（billions of stars）。
十亿
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十亿
the number 1,000,000,000; a thousand million
The new bridge cost over a billion dollars to build.
这座新桥的建造耗资超过十亿美元。
美式用法，也是现代英式常用的含义。
表示1后面加12个零的数字；在英国,常采用美式用法(即1后面加9个零)
the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen
极大的不确定数字(通常为夸张说法)
a very large indefinite number (usually hyperbole)
表示1后面加9个零的数字
the number that is represented as a one followed by 9 zeros
The population of the country is nearly one billion.
这个国家的人口接近十亿。
The company's total assets are valued at three billion.
该公司的总资产估值达三十亿。
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billion 可数；前有数词时单复数同形（two billion）；表示极大、不确定数量时用复数加 of（billions of stars）。
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from AI_FALLBACK, DICTIONARY_API_DEV, ECDICT, WIKTIONARY.