Perfluoroamine
全氟胺
🗣️ 情景例句
How much does a return ticket cost?
返程票多少钱？
What are your interests?
你的爱好是什么？
has spent his lifetime studying active volcanoes and deep caves in all parts of the world.
花了毕生的精力来研究世界各地的活火山和探洞。