Nebramycin
暗霉素
🗣️ 情景例句
His studies advanced steadily.
他的学业不断进步。
What track does the Metroliner leave from?
华纽特快从第几轨道开出？
it must be known to any kind of radio astronomer in the universe.
这个频率是宇宙中任何射电天文学家都应该熟悉的。