求翻译：张望生夫人由于长时间瘫痪在床小便失禁，张望生经常帮助更换尿片。遇到天冷时，张望生就更着急，由于家住3楼，阳光不很充足，尿湿的棉絮很难晾干。张望生是位无线电爱好者，于是便尝试着设计一个报警器。是什么意思？

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Mrs Zhang Wangsheng incontinence due to paralysis in the bed, Zhang Wangsheng often help changing diapers. When it encounters a cold, Zhang Wangsheng more worried, as a freshman, 3 f, sunshine is not abundant, wet batting difficult to dry. Zhang Wangsheng was a radio enthusiast, so they try to desig