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美国发生“9·11”恐怖袭击事件后,在美国和世界其他国家又接连发生多起炭疽病原孢子通过邮件递发传播的恐怖事件。
After the “9.11” terrorist attacks in the United States, numerous incidents of sporadic transmission of pathogenic spores of anthrax through mail have also occurred in the United States and other countries in the world.