acid substance

• 酸性物质

acid substance的用法和样例：

例句

1. The acid in the rain slowly ate away at the stone wall.
   雨水中的酸性物质慢慢侵蚀着石墙。
2. Breast milk can help slow bacterial growth and acid production in the mouth.
   母乳可以帮助减缓嘴里面的细菌生长以及减少酸性物质。