Picture this——a quiet， peaceful， old farmhouse with a barn， fixed appropriately on the outskirts5 of a city of about twenty thousand. Corn fields， old trees， clean air， country roads， and wildlife are all part of the area. Within four years， the people living on this farm step outside on their front porch6 to view an extensive shopping center containing Wal-Mart， JC Penny， Elder-Beerman's， Lowe's， McDonalds， Wendy's， TCBY， and a Cinemark movie theater.
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Most rainforest soils are thin and poor because they lack minerals and because the heat and heavy rainfall destroy most organic matter in the soils within four years of it reaching the forest floor.
大多数雨林土壤都很贫瘠，因为它们缺乏矿物质，而且高温和强降雨会在到达森林地面后的4年内破坏土壤中的大部分有机物。
Within four years they had their first Prius on the road.
在四年内他们开发出了第一辆能够上路行驶的普锐斯混合动力车。
Parkson will triple its number of stores to almost 90 within four years.
而百盛打算在4年内把店铺的数目扩充到近90家，这是目前数目的3倍。
World leaders agreed this week to protect all nuclear materials within four years to stop the possibility of nuclear terrorism.
VOA: special.2010.04.17
And he says his team has already identified two trillion dollars in reductions to help cut the deficit in half within four years.
VOA: special.2009.02.27
"I am announcing a new international effort to secure all vulnerable nuclear material around the world within four years."
VOA: standard.2010.04.06
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