Good morning. Our guest today is Karen Brook. Karen is the managing director of Cube Movie Theater located on Underhill Road. Thank you for coming, Karen.

早上好。我们今天的客人是凯伦·布鲁克。凯伦是位于昂德希尔路的“立方电影院”的总经理。谢谢你能来，凯伦。

[Ryland] Hi, I'm Ryland. I come from Underhill, Vermont. I'm four years old. I want to learn about why bicycles do not fall over when they're going straight or leaning around the curve but they do when they're stopped.

我想了解为什么自行车在直行或绕弯道倾斜时不会翻倒，但在停下来时却会翻倒。