optics vegetation coverage的用法和樣例：
例句
- Field measurement and remote sensing measurement are rudimental approaches to get vegetation coverage.
地表實測和遙感測量是獲取植被蓋度的兩種基本途徑。 - The abilities of holding water and preventing erosion of cropland discarded are stronger than cropland thanks to its higher coverage, more litters and roots.
撂荒地具有較高的植被蓋度和數量較多的草本植物根系以及枯落物的積累，其保水防蝕能力優於農田。
