/'trebl; `trɛbl/
adj, n three times as much or as many 三倍的; 三重的
*a treble portion of ice-cream, ie three times as big as the normal one 三倍分量的冰激凌
* He earns treble my salary. 他挣的钱是我的三倍.

v [I, Tn] (cause sth to) become three times as much or as many （使某事物）增加到三倍或增加两倍
*He's trebled his earnings in two years. 他两年间收入已增加两倍.
* The newspaper's circulation has trebled since last year. 去年以来该报的发行量已增加到原来的三倍.

/'trebl; `trɛbl/
n
(a) highest voice in choral singing, esp the unbroken male voice （合唱中的）最高音（尤指连续的男声）
*a choir of trebles 最高音合唱.
(b) child with such a voice 唱最高音的儿童.
(c) part for such a voice 最高声部
*He sings treble. 他唱最高声部.

adj [attrib 作定语] high-pitched in tone 声调高的; 高音的; 尖声的
*a treble voice 尖利的嗓音
* a treble recorder 高音竖笛
* the treble clef, ie the symbol in music showing that the notes following it are high in pitch 高音谱号. Cf 参看 bass.