Airplanes spread pesticides on crops.
飞机级庄稼喷洒杀虫剂。
It is not known what caused their sudden spread, but experts have theorized that an increase in global travel and the banning of certain pesticides may be partly responsible.
至今它们大肆传播的确切原因不得而知，但专家表示，可能的因素包括全球旅行的增加和某些杀虫剂的禁用。
Where only one crop is grown, pests and disease can spread easily, creating the need for potentially toxic pesticides.
草原变得只生长一种作物。病虫害容易扩散，将增加使用有潜在毒性杀虫剂的需要。
pests and disease can spread easily, creating the need for potentially toxic pesticides.
草原变得只生长一种作物。 病虫害容易扩散，将增加使用有潜在毒性杀虫剂的需要。
pests and disease can spread easily, creating the need for potentially toxic pesticides.
草原变得只生长一种作物。 病虫害容易扩散，将增加使用有潜在毒性杀虫剂的需要。
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