1.8亿用英语怎么说

"1.8 billion" in English can be translated as "one point eight billion" or "one billion eight hundred million."

The term "billion" is used in both English and Chinese to refer to the number 1,000,000,000 (one thousand million). It comes from the Old French word "billion," which in turn comes from the Italian "bilione," which is a combination of the words "bi-" (meaning "two") and "lione" (meaning "lion"). The original meaning of "billion" referred to a million million (1,000,000 x 1,000,000), but over time the meaning has changed to refer to 1,000,000,000.

Here are some example sentences using the term "one point eight billion" in English:

"According to the latest estimates, the global population is now over one point eight billion." (世界人口根据最新估计已超过1.8亿。)
"The company reported record profits of over one point eight billion dollars last year." (公司去年的利润超过1.8亿美元。)
"The project is expected to cost around one point eight billion dollars to complete." (预计完成这个项目的费用大约为1.8亿美元。)

Here are some example sentences using the term "one billion eight hundred million" in English:

"The government announced that it would allocate one billion eight hundred million dollars to the education budget for the next fiscal year." (政府宣布将在下一财政年度拨款1.8亿美元用于教育预算。)
"According to the latest data, the country's GDP is now over one billion eight hundred million dollars." (根据最新数据，该国GDP已超过1.8亿美元。)
"The research team received a grant of one billion eight hundred million dollars to fund their work." (研究小组获得1.8亿美元的赠款来资助他们的工作。)