treble
[ˈtrɛbəl]
adj.
三倍的，三重的;
高音的;
最高声部的;
尖锐刺耳的;
vt.& vi.
使成为三倍;
增加两倍;
n.
最高音部，高音;
三倍;
vi.
变成三倍;
例句:
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They will have to pay much more when rents treble in January.
一月份房租增加两倍时，他们将被迫多付不少钱。
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More than 7 million shares changed hands, treble the normal daily average.
有700多万股换手，是通常日平均成交量的3倍。
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to turn up the treble on the stereo
把立体声唱机的高音音量调大
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The recording needs treble boost, but is otherwise excellent.
来自Listener
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Double six thousand, and then treble that.
来自Merchant of Venice,Shakespeare
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It was attended with a treble difficulty.
来自Sir W. Scott