Fertility starts to drop at an annual income per person of $1, 000-2, 000 and falls until it hits the replacement level at an income per head of $4, 000-10, 000 a year (see chart 2).

人均年收入到1000至2000美元时，生育率开始降低，收入到4000至10000时，生育率降到生育等值更换水平（见图表2）。

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A probe is further made into unmanned operation programme on the basis of current supervising ability of two head stocks per person.

在对车头进行省力化探索过程中，一人管理两个车头取得成功。

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The cost of conducting the first head count was$ 44377.28--just over a penny per person.

第一次人口统计花费了美元四万四千三百七十七元二角八分，平均每人刚刚超过一分钱。

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Bruce Leslie, who worked with the White House on per-capita caps as a Senate staffer in 1997 and is now the head of First Focus, said per-person caps are better than block grants, but the policy is unusually difficult to write into law.

FORBES: Why Block-Granting Medicaid Will Result in Better Health Care for the Poor