核心问题
There is very little rain here, merely 60mm in a year on average.
句中的 on average 是否应改为 on an (the) average?
词典解答
on average, on an average 和 on the average 都是正确的:
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Every tonne of coal contains, on average, 30 kilograms of nitrogen. 每吨煤平均含30公斤氮。
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On average we receive 5 letters each day. 我们平均每天接到五封信。
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He smokes twenty cigarettes a day on an average. 他平均每天吸20支香烟。
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On the average I see about ten students a day. 我平均每天大约见 10 个学生。