it would be very d___ for us to travel to space ,if w___ aren't astronauts .
问题描述：
it would be very d___ for us to travel to space ,if w___ aren't astronauts .
答
it would be very difficuit for us to travel to space ,if we aren't astronauts .
如果我们不是宇宙航行员,那么游览太空将会是很艰难的.