Dudley's latest research suggests that the hippos'could owe their unique susceptibility to anthrax die-offs to their practice of eating meat that carries the infection—including the bodies of other dead hippos.

杜德利最新的研究表明，河马易感染炭疽病疫情是因经常食用包括其他同类尸体在内携病毒的类。

Today, astronauts can still carry NASA-approved  personal items and mementos aboard missions, but coins, stamps, and postal materials  that, " by their nature, lend themselves to exploitation by the recipients" , are forbidden by federal regulation.

如今，宇航员仍可在任务中携家航空航天局批准的个人物品和纪念品，但根据联邦法规，硬币、邮票及邮政材料等“因其性质易被收件人利用”的物品则被禁止携。