求翻译：热带雨林的减少主要是由于烧荒耕作、过度采伐、过度放牧和森林火灾等，其中烧荒耕作是首要原因，占整个热带森林减少面积的45％。在垦荒过程中，人们把重型拖拉机开进亚马逊森林，把树木砍倒，再放火焚烧。是什么意思？

Tropical rainforests decrease was primarily due to the burning farming, over-harvesting, over-grazing, and forest fires, including burning farming is the primary cause, accounting for 45% of the entire tropical forest area reduction. In the reclamation process, heavy-duty tractor drove into the Amaz

Tropical rain forests of the decrease was mainly because excessive burning farming, logging, overgrazing and forest fires, burning, which is the primary reason for farming, accounted for the entire tropical forest decline in size of 45 per cent. In the reclamation process, it is the heavy tractor to

The tropical rain forest reduction mainly is because burns off vegetation on wastelands the cultivation, cuts, over-grazing and the forest-fire excessively and so on, in which burns off vegetation on wastelands the cultivation is the most important reason, occupies the entire tropics forest reductio

Rainforest is mainly due to the decline of excessive logging, overgrazing and burning grass farming, such as forest fires, burning grass farming is the primary reason, throughout the tropical forests to reduce the area of 45%. In the course of the wasteland, heavy duty tractors into the Amazon fores

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