The defoliation of millions of acres of trees by massive infestations of gypsy moth caterpillars is a recurring phenomenon in the northeastern United States.
在美国东北部，舞毒蛾毛虫的大规模侵扰导致数百万英亩的树木落叶，这是一个反复出现的现象。
Rothamsted Research, home to the Broadbalk experiment, has been tracking aphid infestations for 50 years.
洛桑研究院的Broadbalk实验，五十年来一直在跟踪蚜虫的侵扰。
The resin is produced as a defense mechanism against insect infestations. When it dries it becomes a plasticlike substance that can survive for millions of years.
树脂是树木为防御昆虫侵袭而分泌的物质，变干后呈塑料状，可以留存成百上千万年。
Pheromones are an efficient tool in the prevention and treatment of termite infestations and have consequently been the focus of a considerable amount of research.
采用信息素防治白蚁这种世界性害虫是当前白蚁研究的一大热点。
Eosinophils can increase with allergic reactions and with parasitic infestations.
当过敏反应和寄生虫感染时嗜酸性粒细胞会增多。
In his captions, letters and journals he complained about dirty streets, insects and rat infestations.
在他撰写的图片解说、信函与日记里，他抱怨街道肮脏、虫鼠成灾。
The arrival of warm weather raises the specter of disease and increased rat infestations caused by rotting garbage.
天气转暖使人们担心垃圾腐烂会引起疾病传播和鼠群猖獗。
Bed bug infestations have been reported increasingly in homes, apartments, hotel rooms, hospitals, and dormitories in the United States since 1980, according to background information in the article.
根据文章的背景资料，自从1980年来，美国已报道了在家中、公寓、旅店、医院以及宿舍中温带臭虫的侵袭事件。
Infestations of locusts have increased in both number and severity this summer amid the continuing drought in much of north-west China's Gansu Province, the Lanzhou Morning Post reported.
据《兰州晨报》报道，中国西北部的甘肃省大部分地区持续干旱，而今年夏天的蝗灾无论在次数及程度上均有所恶化。
Infestations of locusts have increased in both number and severity this summer amid the continuing drought in much of north-west China's Gansu Province, the Lanzhou Morning Post reported.
据《兰州晨报》报道，中国西北部的甘肃省大部分地区持续干旱，而今年夏天的蝗灾无论在次数及程度上均有所恶化。
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