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The U.S. health secretary said at a hearing that the U.S. faces a $270 million shortfall in masks. 
           At Holcombe medical device store, the unit price of N95 masks ranges from $20 (equivalent to 140 yuan) to $25 (equivalent to 175 yuan), while a bottle of Purell hand sanitizer with a daily price of $10 is sold to $600 by a third-party seller, 60 times the usual price.