So let's go back to our rocket model.

所以让我们回到开始的火箭模型。

We are launching 5000 model rockets to break a Guinness World Record.

我们正在发射五千枚火箭模型，以打破吉尼斯世界纪录。

Building a model rocket to launch at the science fair.

建造一艘模型火箭在科学博览会上发射用。

Unbelievable. Components I built are on the International Space Station and I get a ticket for launching a model rocket in the park.

难以置信，国际空间站上有我亲手造的零件，可我想到公园发射一个火箭模型还得吃张罚单。

Yan has been a space science enthusiast since he was just 4 years old and makes cardboard rocket models and teaches online classes to other enthusiasts.

严弘森从四岁起就成为了一名太空科学爱好者，他制作纸板火箭模型，并为其他爱好者在线授课。