某些局部因素。如缺血、缺氧、免疫因素、巨细胞病毒和寄生虫感染等毁坏了肠壁内神经嵴细胞。
Some local factors to destroy intestine crest cells such as ischemia, hypoxia, immune factors, Epstein-Barr virus and parasite infection.
茶翅蝽饲养及田间寄生调查结果表明：茶翅蝽在北京地区一年发生2代，且都是局部世代。
In host rearing and field investigation, the bug occurs two generations in Beijing in a year and both are partial generations.
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