natural regeneration的用法和樣例：
例句
- The results show that the main foctor that affects the natural regeneration is elevation, and the coverages of litter and brushwood were next.
結果表明，影響該區森林天然更新的主要因素是海拔高度，其次是灌木層蓋度和枯落物層的蓋度。 - However, the skin's natural rejuvenating processes begin to slow down as time passes by.
但是，隨著年齡的增長，肌膚自然更新的周期便會開始減緩。
