1. 四分音符：clarinet 竖笛,单簧管(黑管) | crotchet 四分音符 | crotchet rest 四分休止符

2. 产钩,取胎钩：cross section 横切面,横断面 | crotchet 产钩,取胎钩 | crwn 冠,牙冠

3. crotchet的解释

3. 小钩：crotched 成分叉的 | crotchet 小钩 | crotcheteer 怪人

4. 怪癖：crossing of experimental factors 实验因素交叉 | crotchet 怪癖 | crotcheteer 有怪癖者

1. 四分音符
    A crotchet is a musical note that has a time value equal to two quavers.

1. a small tool or hooklike implement

2. a strange attitude or habit

    Synonym: oddityqueernessquirkquirkiness

3. a musical note having the time value of a quarter of a whole note

    Synonym: quarter note

4. a sharp curve or crook
    a shape resembling a hook

    Synonym: hook