They contain nothing but speakers each set on a foam mounted speaker baffle. 它们仅仅包含扬声器，每组都安装在垫有泡沫的扬声器反射板上。
What he saw was blue waves flecked with foam, and paler blue sky, both spreading without a break to the horizon. 无奈他只能看见带着点点泡沫的蓝色海浪和灰蓝色的天空，海浪和天空不间断地延伸到地平线的尽头。
