What I do myself is to measure the expansion of the universe, and one of the projects that I carried out in the 1990s used the Hubble Space Telescope to measure how fast the universe is expanding.
我所做的是观测，记录宇宙的膨胀。 在上世纪90年代我所带领的项目中, 有一项就是通过哈勃望远镜 来测量宇宙膨胀速度。