UR

例句：

1. 1. The UR is full of wonder and mystery.
   宇宙充满了奇迹和奥秘。
2. 2. Scientists are still trying to understand the UR.
   科学家们仍在试图理解宇宙。
3. 3. We can't wait to explore the UR together.
   我们迫不及待地想一起探索宇宙。