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...