1.My property was rated at 200 dollars per year.

1.我财产估计每年缴税200美元。

2.The world urban population is rocketing upwards at a rate of 6.5 per cent per year.

2.世界城市人口以每年6.5％速度急速上升。

3.One of the attractions is that a campaign to iodize salt costs only 2 cents to 3 cents per person reached per year.

3.碘人一是每年每人只要花费2到3分钱就可以食用碘。

4.On the contrary, the double cropping rice followed by a cool-loving crop per year and the double cropping rice followed by a thermophilous crop per year are potential carbon sources.

4.而双季稻连作喜温作物和单(双)季稻连作喜凉作物生态系统起着较稳定碳源作用.