a acting or moving or capable of acting or moving quickly
a (used of timepieces) indicating a time ahead of or later than the correct time
a at a rapid tempo
s (of surfaces) conducive to rapid speeds
s resistant to destruction or fading
s unrestrained by convention or morality
s hurried and brief
s securely fixed in place
s unwavering in devotion to friend or vow or cause
s (of a photographic lens or emulsion) causing a shortening of exposure time
r most quickly
a. 最快速的（far 的最高级）
1. The cheetah is the fastest land animal.
豹子是陆地上最快的动物。
2. She finished the race in the fastest time.
她以最快的时间完成了比赛。
3. This car is the fastest model in the showroom.
这辆车是展厅里最快的型号。