少了十倍

decrease n times/n--fold （14） 

decrease by n times（15） 

decrease by a factor of n（16） 

以上三式均譯為：減少到1/n[或：減少(n-1)/n]。 
decrease常被reduce， shorten， go／slow down等詞替代。 

Eg. Switching time of the new-type transistor is shortened 3 times. 
新型電晶體的開關時間縮短了1/3（即縮短到2/3）。 

Eg. When the voltage is stepped up by ten times， the strength of the current 
is stepped down by ten times. 
電壓升高9倍，電流強度便降低9/10（即90％）。 

Eg. The equipment reduced the error probability by a factor of 5. 
該設備誤差概率降低了4/5。