我想发明一种水上垃圾桶。平时，它平稳地漂浮在水中。当有垃圾落到水面上时，水上垃圾桶就会发出一种引力，自动把垃圾吸进桶里。当桶内装满垃圾时，人们只要按一下遥控器上的按钮，水上垃圾桶就会漂到岸边。工作人员把桶内垃圾清除干净后，再按遥控器上的按钮，垃圾桶又会漂 I want to invent a water trash can. Usually, it floats smoothly in the water. When rubbish falls on the surface of the water, the rubbish bin will send a kind of gravitation to automatically suck the rubbish into the buckets. When the bucket is full of garbage, people simply click the button on the remote control, the water trash can drift to the shore. Staff to clean the barrel of rubbish, and then press the button on the remote control, the trash will drift