modulate

动词 modulate:

1. change the key of, in music
2. vary the pitch of one's speech
   同义词：tone, inflect
3. fix or adjust the time, amount, degree, or rate of
   同义词：regulate
4. adjust the pitch, tone, or volume of
5. vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)

1. Music students learn how to add other parts to add other parts to a given tune, and how to modulate to a related key.
   音乐学生学习给一个现有的调子配上其他音部，还要学习怎样转成和声调。
2. A device used to modulate an electromagnetic wave.
   调制器用以调制电磁波的装置

mod.u.late

v.（动词）
mod.u.lat.ed,mod.u.lat.ing,mod.u.lates
v.tr.（及物动词）
To adjust or adapt to a certain proportion; regulate or temper.
调衡：调整或使适应一定的比率；调节或缓和
To change or vary the pitch, intensity, or tone of (one`s voice or a musical instrument, for example).
调整，改变音量：改变或变换如嗓音或音乐装置的音高，强度，或音调
Electronics
【电子学】
To vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves).
调制：变换（电磁波的）频率，振幅，周相或其它特点
To vary (electron velocity) in an electron beam.
调制：在一个电子束中改变（电子速率）
v.intr.Music （不及物动词）【音乐】
To pass from one key or tonality to another by means of a regular melodic or chord progression.
调节：通过和谐的旋律或合弦的相继进行的方式从一个基调或音调过到另一基调或音调
To sing or play with modulation.
变调：用转调演唱或演奏

来源：
Latin modul3ro, modul3t- [to measure off, to regulate]
拉丁语 modul3ro, modul3t- [区分，调节]
from modulus [diminutive of] modus [measure] * see med-
源自 modulus [] modus的小后缀 [测量] *参见 med-

【引伸】
mod.ulabil.ity
n.（名词）
mod.ula.tive 或
mod.ulato.ry