Floodwall
n. 防洪石堤,防洪岸壁
🗣️ 情景例句
There is, Dad.
有， 爸爸。
How about feed-back from your retailers and consumers?
你们的零售商和消费者的反映怎样？
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。