自20世纪20年代以来，科学家已经了解到宇宙正在澎张。这就是说宇宙一定是在过去的某一特定时候开始形成的。

Since the 1920s, scientists have known the universe is expanding, which means it must have started at a definite time in the past.

youdao

自20世纪20年代以来，科学家已经了解到宇宙正在澎张。这就是说宇宙一定是在过去的某一特定时候开始形成的。

Since the 1920s, scientists have known the universe is expanding, which means it must have started at a definite time in the past.

youdao