百万故障率,售后故障率,英文怎么说？

after-sale fault rate
故障率:

1. hazard rate
2. failure rate
3. error rate
4. possibility of trouble
5. fault rate

其它相关解释:
<defects per unit> <FR>

http://sh.dict.cn/search/?q=%B9%CA%D5%CF%C2%CA&r=%CA%DB%BA%F3%B9%CA%D5%CF%C2%CA

fault rate per million
foult rate after sale

?

after-sale breakdown rate