详细解释:在广播, 在电视中
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.羽毛会在空中四处飘动，尤其是在多风的天气。如果遇上阵雨，就会因为淋上雨水变湿就沉，然后就会垂直落回到地上。