YOU SAID:
the universe is very big and we can not explore it all
INTO JAPANESE
宇宙はとても大きく、すべてを探索することはできない
BACK INTO ENGLISH
The universe is so big that you can't explore everything.
INTO JAPANESE
宇宙はとても大きいので、すべてを探索することはできません。
BACK INTO ENGLISH
The universe is so big that you can't explore everything.
You've done this before, haven't you.