natural regeneration的用法和样例：
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.
结果表明，影响该区森林天然更新的主要因素是海拔高度，其次是灌木层盖度和枯落物层的盖度。 - However, the skin's natural rejuvenating processes begin to slow down as time passes by.
但是，随着年龄的增长，肌肤自然更新的周期便会开始减缓。
