hard adj.硬的；困难的；棘手的；坚强的；残酷的；用力的；液态的；严寒的；确凿的adv.努力地；强烈地；严重地；坚定地
双语例句
The positive electrode is a rod of hard carbon fitted with a brass cap. 正电极是一个装有黄铜帽的硬碳棒。
Hard carbon is a promising anode material for lithium ion batteries due to its high capacity and low cost. 摘要硬碳具有嵌锂容量大，造价低，循环寿命长等优点，是制备高安全性锂离子电池负极潜在的优良材料。
