他们已找到另外那个扬声器的连接点了。They've found out where the other speaker plugs in.舞台演出时，乐师实际上坐在扬声器后面演奏。Onstage, the musicians are actually sitting behind the loudspeakers.扬声器作为随身听的附加装置出售。Speakers are sold as add-ons for personal...
Macadam type bases involving successive layers of crushed rock bound with rock dust were also used.人们曾经使用“石结”基层——几层由石粉黏结在一起连续的碎石层.The construction techniques of cement treated macadam base are always paid more attention ...