slow down
(指开车、走路或行动上)慢下来
keep up with
赶上...的速度，不落于...之后
walk as slowly as a snail
走得与蜗牛一样慢
snail [sneil]
n.蜗牛
s+nail指甲→背着指甲大小的壳S形爬行→蜗牛
keep fit
保持健康
fit [fit]
a.健康的
work out
运动(尤指体操、有氧舞蹈等增进体能的运动)
