But even when parents follow all the guidelines, putting their babies to sleep on their backs, removing blankets and stuffed animals from their cribs, infants still die without warning.

VOA: standard.2010.02.08

the dinosaur bones, and the animals and all of these like stuffed, these images behind glass of,

恐龙的骨头，以及这些被做成标本的动物，这些玻璃背后的形象，

自然历史博物馆 - SpeakingMax英语口语达人