1、*float [fləut] vi. & vt. （使）浮动；（使）漂浮n. 漂浮物【助记】flow流+boat船→float。
http://player.youku.com/player.php/sid/XMTYzMjU1MzM0NA==/v.swf2、*float :【英释】If something or someoneis floatingin a liquid, they are in the liquid, onor just below the surface, and are being supported by it. You can alsofloatsomething on a liquid.
http://player.youku.com/player.php/sid/XMTYzMjU1MzM0NA==/v.swf3、*float :【例句】Empty things float. 空的物体会在水中浮起。