International travel, immigration, changes in pest control practices and insecticide resistance may have contributed to a recent resurgence of this blood-sucking insect in developed countries.
国际旅游、移民、虫害防治手段的改变以及杀虫剂不再有效，这都会导致近些年在发达国家这种吸血昆虫的肆虐。
International travel, immigration, changes in pest control practices and insecticide resistance may have contributed to a recent resurgence of this blood-sucking insect in developed countries.
国际旅游、移民、虫害防治手段的改变以及杀虫剂不再有效，这都会导致近些年在发达国家这种吸血昆虫的肆虐。
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