It requires high levels of motivation that are sustained for many years.
这就要求保持多年高度的学习积极性。
Growth is good, but it will have to be sustained for many years before most Afghans feel the benefits.
增长是好事，但是要想让阿富汗人从中得到好处，经济必须连续增长很多年。
Growth is good, but it will have to be sustained for many years before most Afghans feel the benefits.
增长是好事，但是要想让阿富汗人从中得到好处，经济必须连续增长很多年。
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