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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
As China tightened anti-disease controls ahead of the Winter Olympics, people in a Beijing district with some 2 million residents were ordered to undergo mass coronavirus testing following a series of infections.
Source: https://wtop.com/back-in-the-day/2023/01/today-in-history-jan-23-abc-begins-mini-series-roots/