Fisser
可裂变物质
🗣️ 情景例句
It's been a pleasure to talk to you.
和你谈话是件很愉快的事。
There is a black sheep in every flock.
群群羊中有黑羊。
I went further back into the cave and stopped still.
我向前走拐进岩洞，停住不动。