Computer vision can prevent sales, too.In Japan it recently became illegal to sell tobacco from vending machines without verifying that customers are at least 20 years old.

除了促进销售，计算机视觉技术同样也可以用在阻止销售方面，最近在日本，通过自动贩卖机销售香烟，如不验证购买对象是否年满20周岁，将被视为非法。

youdao

Computer vision can prevent sales, too. In Japan it recently became illegal to sell tobacco from vending machines without verifying that customers are at least 20 years old.

除了促进销售，计算机视觉技术同样也可以用在阻止销售方面，最近在日本，通过自动贩卖机销售香烟，如不验证购买对象是否年满20周岁，将被视为非法。

youdao

He became dependent on alcohol and the illegal drug,heroin.

VOA: special.2009.05.03

"we became gradually aware that illegal logging is pervasive around the world."

VOA: standard.2010.05.28

In 1954 it became illegal to take birds' eggs from the wild.

BBC: Birdwatcher gave 1922 cuckoo clue

On January 26, 2013, it became illegal to unlock new phones.

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Ice Cream sundaes were invented when it became illegal to sell ice-cream sodas on a Sunday in the American town of Evanston during the late 19th century.

BBC: CBBC Newsround | ICE-CREAM | The origin of ice-cream