回答
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The population of the U.S.A. is roughly three times the population of Japan.
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There are about three times as many people in America compared to Japan.
ーThe population of the U.S.A. is roughly three times the population of Japan.
「アメリカの人口は日本の人口の約3倍だ。」
population で「人口」
roughly three times で「約3倍」
ーThere are about three times as many people in America compared to Japan.
「日本と比べ、アメリカには約3倍の人がいる。」
about three times as many people で「約3倍多い人々」
ご参考まで!