float about的用法和樣例：
例句
- A feather floats about on the air, especially on a windy day. If there is a shower of rain, the feather will get wet and heavy with water, and then it will sink straight to the ground.
羽毛會(huì )在空中四處飄動(dòng)，尤其是在多風(fēng)的天氣。如果遇上陣雨，就會(huì )因為淋上雨水變濕就沉，然后就會(huì )垂直落回到地上。
