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

The ground is as hard as stone after the long drought. 长期干旱之后,土地硬得就像石头一样。

It's very hard to maintain a relationship. 要维持一段关系,是很困难的。

He likes to pretend he is hard, but he is really soft underneath. 他喜欢故作坚强,但是他内心真的很脆弱。

She has really good looks but a hard heart. 她确实长得漂亮,可是却有一颗残酷的心。

He gave the door a hard shove and it opened. 他猛地一推门,门开了。

I don't want to go out in such hard weather. 我不想在这么冷的天气里出门。

We need some hard evidence to support our claim. 我们需要一些确凿的证据来支持我们的主张。

Most importantly, you must work hard to catch up. 最为重要的是,你必须努力学习,迎头赶上。

The senator was hard opposed by her rivals on the issue of social welfare. 那名参议员在社会福利问题上遭到对手强烈的反对。

Small businesses in particular were hit hard by the recession. 尤其是一些小企业在经济萧条中遭受了严重的打击。

You need to keep moving ahead hard and confidently. 你要坚定而充满信心地走下去。

hard一般表示“困难的”。 This is a hard question to answer.这是个难题，不好回答。

hard在hard of hearing（有些聋的）中有特殊含义“艰难的”，注意不适合用在别处；

hard后可接of和表示动作的名词。 This food is hard of digestion.这个食物很难消化。

注意hard一般不会和impossible连用，可选择将difficult同impossible连用。 It is hard, if not impossible.这个表达是错误的。

短语a hard time表示一个人的“困难时期”，而hard times则表示“不景气”。

hard作“困难的”解时,指要消耗很大的体力去做某事,有时也指精神上的困难。

hard还可表示“费力的,费神的,艰难的” “持强硬态度的,不妥协的,不让步的” “有力的,猛烈的,严厉的” “困苦的,难以忍受的” “(声音)刺耳的,(颜色)刺目的” “酒精含量高的”等。

hard在句中可用作定语或表语,其后可跟for〔to, with〕等介词短语、动词不定式、that从句。

hard是对主语具有评价意义的形容词,说明主语在哪方面“难”。接动词不定式时,句子的主语不是该不定式的主语,而是该不定式的宾语。

hard修饰动态动词,位于实义动词之后。