在反应中，这些碎片起一种媒剂的作用。
据外媒报道，美国食品和药物管理局日前批准用艾尔建公司生产的抗皱纹注射剂肉毒杆菌素治疗慢性偏头痛。
The US Food and Drug Administration has approved Allergan Inc's anti-wrinkle injection Botox for the treatment of chronic migraines, foreign media reported.
特别是近几年来由于抗药性疟原虫虫株及抗杀虫剂蚊媒的产生及蔓延，传统防治疟疾的方法受到新的挑战，因此研制一种有效的疟疾疫苗是疟疾防治的重要替代途径。
Traditional methods to controlling malaria have met great challenges due to emergence and rapid spread of the drug-resistant strains of the parasite and insecticide-resistant mosquito vectors.
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