Outside the United States, though, in Botswana and Zimbabwe, insect gathering is becoming commercialized.
尽管如此，在美国本土之外，博茨瓦纳和津巴布韦正在将昆虫采集商业化。
Asiatic insect introduced accidentally into United States; pest on citrus and apple trees.
偶然引入美国的亚洲昆虫；对柑橘树和苹果树有害。
Several states list the honeybee as their state insect.
有几个州把蜜蜂列为它们的州虫。
No single factor is blamed, but researchers in the United States and Europe mostly cite urban sprawl and industrial pollution that destroy insect habitat.
这并非单个原因造成的，但是美国和欧洲的研究者们认为主要是城区的扩张和工业污染破坏了昆虫的生活习性。
Mister Stephenson says summers are becoming longer and hotter in the western United States. This makes trees weaker and decreases their ability to survive insect attacks and forest fires.
斯蒂芬森先生称，现在美国西部的夏季变得更长了，天气变得更热了。这使得树木的生命更脆弱，削弱了树木逃脱虫害和火灾的能力。
In the northern states fumigation is needed only after insect outbreaks occur.
在北部各州，只在虫害发生后才进行熏蒸。
In the northern states fumigation is needed only after insect outbreaks occur.
在北部各州，只在虫害发生后才进行熏蒸。
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