【英语时差8,16】墨西哥跳豆为什么会跳跃（上）

（单词翻译）

On the table in front of you, it looks like a small, dried bean. Pick it up. To your surprise, it starts to wiggle, shifting around nervously¹ in your palm. Suddenly, it squirms back onto the table again. We’ve all heard stories about Mexican jumping beans. What are they, and how do they do that remarkable² trick? Actually, jumping beans aren’t beans at all. They are the seed pods of a certain shrub³ that grows in the rocky desert areas of northern Mexico and the American southwest. These seed pods can’t jump by themselves. What makes a jumping bean so jumpy is the larva of a small grey moth⁴ that has burrowed⁵ inside the seed pod and eaten the seed.