Biostratigraphy
生物地层学
🗣️ 情景例句
Have you ever held a secretarial position?
你曾当过秘书吗？
I enjoyed meeting and talking to you, and sharing the time together.
见到了你们大家，我们一起交谈共度时光。
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。