關恆說，被逮捕之後，執法人員給他兩條出路，見法官或自願離境。
Tracing and identifying the sources of an outbreak is a challenging task that can take months or years. Thanks to the Blockchain, however, companies now know exactly where their food has been—so they can trace its location and prevent future outbreaks.
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Риши Сунак и Владимир Зеленский. Фото: Ukranian Presidency / Handout / Anadolu via Getty Images