After the washing machine is used, it is necessary to dry the old man and the child.

The 90-year-old grandmother never let the washing machine wash clothes. She said, "I am afraid that you will wash my clothes dirty." Grandma does not go online, does not read newspapers, and rarely watches TV, but she knows that the washing machine is dirty. Indeed, as early as a few years ago, a sample survey of the sanitary conditions of washing machines that had been used for more than half a year pointed out that 81.3%

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