| 单词 | permanent hardness |
| 释义 | Word Frequency permanent hardnessnoun chemistry hardness of water that cannot be removed by boiling as it results mainly from the presence of calcium and magnesium chlorides and sulphates |
| 随便看 |
英语词典包含233703条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。