一类光度强且质量大的星系giant galaxy

• 虽然我们找到了一些巨星系，但未知的还有很多。

  Although we have found a giant galaxy, there are still many unknowns.

• 跟我们的银河系非常类似的早期巨星系，在形成后很快停止生长。

  An early giant galaxy similar to our own Milky Way stopped growing soon after it was formed.