natural alkalinity

例句：

1. 1. The natural beauty of the forest is breathtaking.
   森林的自然美景令人叹为观止。
2. 2.She wore a natural color dress that matched her skin tone perfectly.
   她穿着一件与肤色完美匹配的天然色连衣裙。
3. 3. The company's natural resources are limited.
   该公司的自然资源有限。