Homonucleside
同型核苷
🗣️ 情景例句
I had planned to wear them.
我早就预备戴它们。
A thousand words will not leave so deep an impression as one deed.
千言万语不如一个行动。
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。