ppb
Initialism of parts per billion.
(LGBT) A sexual orientation characterized by an attraction to people of many, but not all, genders.
Abbreviation of low-resolution.
(zoology) A family of perciform fish native to Africa and Asia, Channidae. / (slang) A Chinese smuggler, especially one who smuggles people / (derogatory, slang, ethnic slur, US) A black person.
規制当局は公衆の健康を守るために、汚染物質の許容限度を数十億分の一のレベルに設定している。
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