n.葉浮；浮起；金屬粉末懸浮現(xiàn)象
動詞leaf的現(xiàn)在分詞.
The leaves turn yellow in autumn. 秋天時葉子變黃。
The plane trees lining the main street are leafing out. 大街兩旁的梧桐樹已冒芽長葉。
