Pbd
abbr. paperboard 纸板; particle board 刨花板，木屑纤维板
🗣️ 情景例句
At today's exercise class...
今天上健身课的时候……
A wise man thinks all that he says,a fool says all that he thinks.
聪明人想了才说，愚笨的人想着就说。
when a significant number of people are living permanently in space.
如果有相当数量的人永久性地住在太空，