我的理解是：regulation改变了，意思是说口罩没达新的标准，这次病毒太厉害了。

来源: 酒绿春浓于 2020-03-19 09:42:54 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.