Correct
变速
/ biànsù /
Strokes
Definition
to change speed/to shift gear/variable-speed
Example
As a Noun
speed change; gear change/shift
1
Zìdòng
自动
biànsùxiāng
变速箱
yóu
油
automatic transmission fluid
2
Biànsù
变速
sǎomiáo
扫描
variable-speed scanning
3
Biànsù
变速
chuándòng
传动
variable transmission