Polyethylenamine
聚乙烯胺
🗣️ 情景例句
What's the daily special?
今天有什么特价菜？
I'm glad to hear about your new job.
我很高兴得知你获得了新工作。
Shortly after this the famous H. M. S. Challenger expedition established the study of the sea-floor as a subject worthy of the most qualified physicists and geologists.
此后不久，英国著名的“挑战者”号舰艇对海底的那次考察，把对海床的研究确立为一个值得一流物理学家和地质学家从事的研究课题。