Bulbus rhachidicus
[医] 延髓
🧩 词语组成解析
[医] 球, 鳞茎, 球茎
🗣️ 情景例句
Look before you leap.
三思而后行。
Henry got a toothache and asked to be excused.
亨利牙疼，请求离开一下。
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。