努力的英文hard相关知识如下：
hard，英语单词，主要用作为形容词、副词、名词，作形容词时意为“努力的；硬的；困难的；辛苦的；确实的；严厉的；猛烈的；冷酷无情的”，作副词时意为“ 努力地；困难地；辛苦地；接近地；猛烈地；牢固地”，作名词时意为“人名；(英、芬、瑞典)哈德”。
单词用法：
根据柯林斯英汉双解大词典：
意为：
1.ADJ Something that is hard is very firm and stiff to touch and is not easily bent, cut, or broken. 坚硬的。
2.hardness N-UNCOUNT 坚硬。
3.ADJ Something that is hard is very difficult to do or deal with. 困难的。
4.ADV If you work hard doing something, you are very active or work intensely, with a lot of effort. 努力地 [ADV after v]。
萨克有声
