foliage n. 叶子(总称)
frond n. 羊齿、棕榈等的叶子
needle n. 针叶;针
spear n. 嫩叶;矛;v. 刺戳
deciduous adj. 落叶的;脱落的;非永久的;短暂的
defoliate v. (使)落叶
defoliator n. 落叶剂
shed v. 脱落(叶子);流出(眼泪等)