slowness和slowdown的区别

slowness ，迟缓;迟缓术;迟钝;慢活;

例句，

The Domestic Studies of the Reasons for the Slowness of Normalization of Sino-US Relations

国内学术界关于中美关系正常化进程迟缓的原因研究

slow down，慢点;（使）放慢;（使）减速;（使）身心松弛;（使）放松;

例句

Slow down ─ I can't keep up!

慢点——我跟不上了。