Spherosiderite
球菱铁矿
🗣️ 情景例句
sacrifices have to be made by one partner from time to time.
总要有一方必须不时做些牺牲。
Will you please call me back?
请你回我一个电话好吗？
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。