Porocity
透气度(以秒 /100 毫升空气表示), 多孔性, 疏松度, 孔隙性
🗣️ 情景例句
They say it's going to rain tomorrow.
据说明天有雨。
Leaves are falling.
叶子落了。
What happened before printing was invented?
印刷术发明以前是怎么一回事？