投诉率的英文：
Complaint Rate

complaint是什么意思：
n. 抱怨；抗议；控告

Viewers jammed the switchboard with complaints.
打电话投诉的观众是总机应接不暇。

I recounted Egyptian complaints.
我重述了一下埃及方面的不满意见。

He was irritated by their perpetual complaints.
他们不断发牢骚把他惹火了。

Students made a rash of complaints.
学生们发出一片抱怨声。

To relay any customer complaints to supervis.
处理并向主管汇报客人的投诉。

rate是什么意思：
n. 比率，速率；费用
v. 评估；认为；划分等级；值得

cumulative rating
累积收听率

These bonds have an AAA rating.
这些债券的信用度是3A级的。

To rate too low;underestimate.
低估对…估价太低；低估

A Lump Sum Rate of ...
费用合计…

To reduce in rank or rating;demote.
使降级降低级别或降级；使人降级