He anticipates a world with the share of people who are native English speakers slips from 9% in the mid 1990s to 5% in 2050.(2006年12月23日大学英语四级真题试卷)
slide v. 滑动,滑落 n. 滑动;滑面;幻灯片
I was sliding helplessly . 我(在冰上)身不由己地滑起来了.
have a slide on the ice 在冰上滑行
bacteria n. 细菌
bacterial contamination 细菌感染.
breed n. 种,品种 v. 繁殖,产仔
What breed is your dog? 你的狗是什麽品种的?
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