要弄清楚宇宙有多大是困难的 It is ___ ___ ___large the___IS
问题描述：
要弄清楚宇宙有多大是困难的 It is ___ ___ ___large the___IS
答
It is difficult to know how large the universe is
要弄清楚宇宙有多大是困难的 It is ___ ___ ___large the___IS
It is difficult to know how large the universe is