《》2018年7月刊 Koko, the gorilla whose apparent aptitude for sign language endeared her to fans around the world, died in her sleep on Tuesday morning, according to the Gorilla Foundation, which oversaw her care. She was 46. ... Koko's language skills earned her a spot on the cover of National Geographic in 1978 and 1985, and she was the subject of many documentaries. By the time of her death, Koko's vocabulary had ballooned to more than 2, 000 words, according to the foundation. “Koko touched the lives of millions as an ambassador for all gorillas and an icon for interspecies communication and empathy, ” the Gorilla Foundation said in a statement. “She was beloved and will be deeply missed.” 1.The underlined word "balloon" means __________. 2.The underlined word "interspecies" means __________.