We no longer manufacture pure cotton shirts as their retail prices tend only to attract that upper end of the market.
我方已不再生产纯棉衬衫因为其零售价格只能吸引高档消费者。
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。