Subparticle
亚微粒子, 微细颗粒
🗣️ 情景例句
Good. Do you have any back or knee problems?
好。你的背部和膝关节有什么毛病吗
Troubles never come singly.
祸不单行。
What a pity! Never mind. We must get together some other time for a chat.
真可惜！不过不要紧。我们必须找个时间聚一聚、聊一聊。