Certainly, in the last 15 years, we've seen increasing numbers of planets outside of our solar system being confirmed, and just last month, a couple of weeks ago, a planet in the size-class of Earth has actually been found.
当然，在过去的十五年中 我们看到 越来越多的系外行星被确认存在 就在上个月，几个星期之前 一个地球大小的行星 刚刚被发现