Metatherian
a. 后哺乳下纲的,后兽亚纲的
🗣️ 情景例句
Yes, sir.
是的， 先生。
I'll think it over.
我仔细考虑一下。
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。