1. 详述：derive 起源,获得 | descant 详述 | describe 形容,描写,叙述

2. 详论：auxiliary brake 副制动器 | descant 详论 | OAP Old Age Pension, 养老金

3. 曲调：descaler 除锈剂 | descant 曲调 | descant 唱歌

4. 唱歌：descant 曲调 | descant 唱歌 | descartes 笛卡儿

1. (乐曲的)上方音部，高音部
    A descant is a tune which is played or sung above the main tune in a piece of music.

    e.g. An elderly woman, arms crossed, sang the descant.
           一位双臂交叉的老妇人演唱了高音部。

1. a decorative musical accompaniment (often improvised) added above a basic melody

    Synonym: discant

1. talk at great length about something of one''s interest

2. sing by changing register
    sing by yodeling

    e.g. The Austrians were yodeling in the mountains

    Synonym: yodelwarble

3. sing in descant