As a result, planes were kept in a holding pattern, sometimes three or four miles apart, until they were cleared to land.
结果，飞机均被保持在等待航线状态，有时相隔三四英里，直至它们得到降落指示。
Farmers cleared the land they lived on.
农民在他们居住的土地上开垦。
First, as they grow taller, big trees become thicker and less flexible: when winds blow across the surrounding cleared land, there is nothing to stop their acceleration.
首先，随着大树长高，它们变得越来越粗、越来越不灵活：当风吹过周围的空地时，没有什么可以阻挡它们加速。
They cleared the land, planted crops, and prepared lumber to build their new homes.
他们把地清除，种农作物和准备木材以建立他们的新家园。
The US scientists believe that small populations released carbon emissions as they cleared large tracts of land to produce relatively meagre amounts of food.
美国科学家认为，先民们虽然人口很少且所能生产的粮食数量不多，但他们为此将大片土地通过烧荒变为耕地，从而排放出二氧化碳。
The US scientists believe that small populations released carbon emissions as they cleared large tracts of land to produce relatively meagre amounts of food.
美国科学家认为，先民们虽然人口很少且所能生产的粮食数量不多，但他们为此将大片土地通过烧荒变为耕地，从而排放出二氧化碳。
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