努力的英文hard相關知識如下：
hard，英語單詞，主要用作為形容詞、副詞、名詞，作形容詞時意為“努力的；硬的；困難的；辛苦的；確實的；嚴厲的；猛烈的；冷酷無情的”，作副詞時意為“ 努力地；困難地；辛苦地；接近地；猛烈地；牢固地”，作名詞時意為“人名；(英、芬、瑞典)哈德”。
單詞用法：
根據柯林斯英漢雙解大詞典：
意為：
1.ADJ Something that is hard is very firm and stiff to touch and is not easily bent, cut, or broken. 堅硬的。
2.hardness N-UNCOUNT 堅硬。
3.ADJ Something that is hard is very difficult to do or deal with. 困難的。
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]。