trebling

Their profits have trebled in the last two years.

最近两年他们的利润增加了三倍。

After uncovering of treble part we see valves underlaid by felt.

揭露高音部分以后我们看见毛毡支持的阀门。

If the British were as bountiful as the Americans,donations to charities would more than treble.

如果英像美样慷慨,么给慈事业的捐赠将超的3倍。

It's value has trebled.

它的价值已增长到原来的三倍。

His salary is treble mine.

他的工资是我的三倍。

They exist in four sizes: treble, tenor, bass, and double bass (violone).

高音、次中音、低音和双低音（低音提琴）。