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Use "sub-zero" in a sentence
"Brooks's husband, Charlie, a race-horse trainer, even runs an alternative medicine "kriotherapy" centre at Champneys, the country house resort in Tring, which uses sub-zero temperatures to treat ailments."
"The government appealed for communities to watch out for vulnerable neighbours after two people caught out in sub-zero temperatures were found dead."
"Made out of silicone, they rinse off easily and won't crack in sub-zero temperatures."