摧毁了将近五千个人口贩卖集团。

Nearly 5, 000 human trafficking groups have been broken.

每年平均有五千个调查在进行。

An average of 5.00 surveys has (or have) been conducted each year.

我上大学以来大约学了五千个英语单词。

I have learned about 5,000 English words since he went to college.