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I think we all have had the same experience, we could easily be hurt when we drink hot soup. The gray part of soft-key will automatically become soft when the temperature exceeds 45 degrees so that we can prevent the soup is hot.
Jiangxi University of Finance and Economics
Nanchang, China
Jiangxi University of Finance and Economics
Nanchang, China
ｙｏｎｇｚｈｏｎｇ ｈｅ
ｘｉａｒou ｙａｎｇ
ｊｕｎｊｕｎ ｘｕ
ｙｉqｉ ｌｉｕ
