But then a big difference happened about 50 years ago, after Sputnik was launched. We launched the first American satellite, and that's the one you see on the left in there.
不过50年前，发生了一件不同凡响的事， 苏联人造卫星发射后。我们发射了第一颗美国卫星， 卫星就在左边的照片里。