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1·The mine reportedly had an accident rate treble the national average.

据报道，那个矿的事故发生率是全国平均水平的三倍。《柯林斯英汉双解大词典》

2·Fifty-nine percent of its residents have attended graduate school – quadruple the national average.

该地区59％的居民读过研究生–是全国平均水平的4倍。《柯林斯英汉双解大词典》

3·Asan's birthrate is 1.08, much lower even than the low national average, according to Ko Bun-Ja, one of deputies helping organize the event.

据协助组织这次活动的代表 Ko Bun-Ja，牙山市的生育率是1.08，甚至远远低于全国平均水平。

4·Unemployment here is twice the national average.

这儿的失业率是全国平均数的两倍。《柯林斯英汉双解大词典》

5·Class sizes in the school are below the national average.

这所学校班上的人数少于全国平均数。《牛津词典》

6·The national average farm size is around 440 acres, but his is only one acre.

全国平均农场面积约为440英亩，但他的农场只有一英亩。

7·The national average is 72%.

从全美范围来看，这一数值是72%。

8·Just what is the national average?

全国的平均水平是多少？

9·Unemployment, at 14.1%, is almost twice the national average.

失业率达到了14.1%，这几乎是国家平均失业水平的两倍了。

10·Their unemployment rate, at 30%, is well above the national average.

他们的失业率为30%，大大高于国家平均水平。