"宇宙是一个相当大的地方。如果只有我们，似乎是极大的浪费。"

Simplified Meaning:

The quote is saying that the universe is incredibly huge and full of possibilities. Imagine you’re in a gigantic city with countless houses, but your house is the only one with people in it. That would feel really lonely, and you might wonder why all those other houses are there if no one else is using them. In the same way, our universe has billions of stars and planets, so it feels strange to think that Earth might be the only place with life. It suggests that maybe, somewhere out there, other forms of life could exist, and we are not alone. This idea invites us to stay curious and open-minded about the mysteries of the universe. You can apply this thought by embracing the unknown and being open to exploring new ideas and possibilities. Just like explorers venturing into new territories, staying curious can lead to amazing discoveries and help us understand more about the world and our place in it.