an average of

基本解释

Many states with higher income and education levels are already near or below an average of two children per family.
在一些收入和教育水平较高的邦，平均每户家庭只生养了两个或不到两个孩子；
But in the short term, individual Americans buying cover for next year have already seen their premiums increase by an average of around 20%.
而从短期来看，每一个购买了下年医疗保险的美国人都已经看到他们的保费平均增加了20%。
Data captured by the DTW benchmarking tool during this test run showed that the database was processing an average of 302.93 transactions per second.
DTW 基准测试工具在这个测试执行过程中所获得的数据表明，这个数据库每秒平均处理 302.93 个事务。

American children now spend an average of seven and a half hours a day watching television or playing with electronic devices.
Okay. How many people would say they were off by an average of zero to ten percent?
多少人低估了,平均从0到10%
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It's got an average valence electron energy of about 16 eV, 16.5 eV, which is a lot greater than 11.
它的平均价电子能,大约是16eV，16。5eV，那比11要多很多。
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Assuming an average of 20 claims each, that is 5, 000, 000 restrictions on smartphone innovation.
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