Earphone range knowledge: instrument or human sound can reach the treble and the bass!
耳机音域知识：乐器或人发出声音所能达到最高音与最低音之间的范围！
The mine reportedly had an accident rate treble the national average.
据报道，那个矿的事故发生率是全国平均水平的三倍。
The victory completed a treble for the horse's owner.
这次胜利使得马主获得三连胜。
We will treble the sale this year.
我们今年要让销售额增加两倍。
Singing voice singing the dumb, always sing less than want that treble.
放声歌唱把嗓子唱哑了，始终唱不到想要的那个高音。
They want to treble harper & grant's business over the next few years .
他们想今后几年内使哈珀-格兰特公司的营业额骤增两倍。
There was a treble knock at the door.
门上响起了三声敲门声。
There was a treble knock at the door.
有人在门上敲了三下。
There was a treble knock at the door.
有人在门上敲了三下。
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