But, my dear niece, please do consider my words very carefully before you decide.
但是我的孩子,在你做出决定之前请一定要认真考虑我的话。
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.
然而,在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。