hard
单词辨析：
指因需要努力或技巧而难以做成、理解或处理的。
Moving that huge stone was difficult.
移动那块大石头很费劲。
The poem is difficult to read.
这首诗很难读懂。
The entrance exam of that school was not difficult.
那所学校的入学考试不难。
尤指在一段时间内需耗费大量体力和精力才能完成的。
The arduous task is of great challenge to him.
这项艰巨的工作对他是个很大的挑战。
All the 6 adventurers survived the arduous journey through the desert.
6名探险家都完成了穿越沙漠的艰难旅程。
指事情不好理解、处理或不容易做的。
He found that it is hard to learn English well.
他发现学好英语很难。
It's hard to say which is right.
很难说哪一个是正确的。
More practice will make us a hard team to beat.
多加练习，我们就能成为一支难以战胜的球队。
因存在或将会引发问题等而难以完成或处理的，尤指在情感上难以抉择的。
His company survived a tough year.
他的公司挺过了艰难的一年。
Those tough questions really embarrassed him.
那些难以回答的问题的确让他很难堪。
指不软也不是特别硬，但不易变形的。
She can't sleep well on a firm mattress.
她在硬床垫上睡不好。
He bought several firm green apples on his way home.
他在回家的路上买了几个硬的青苹果。
指硬实得难以按下、切开、弄碎等的。
This piece of rock is so hard that you can barely embed anything in it.
这块岩石太硬了，几乎什么也嵌不进去。
There was almost no rain this year so the ground is now as hard as stone.
今年一年几乎没下雨，现在土地硬得像石头一样。
指材料很硬，很难或无法弯曲的。
Be careful! This kind of plastic is inflexible.
小心！这种塑料不能弯曲。
形容人时指某人神态严肃的或待人处事要求严格、不讲情面的；形容事物时指法律、批评等异常严厉的，近乎苛刻。
The general had a severe manner.
那位将军态度严肃。
My teacher was equally severe on students who were late for class.
我的老师对所有迟到的学生都同样严厉。
The Prime Minister came under severe criticism for his handling of the crisis.
首相对这场危机的处理受到了强烈批评。
指人的举动令人觉得毫无怜悯之心的。
He is a cold-hearted man.
他是一个冷酷无情的人。
I had no idea he could be so cold-hearted.
我没想到他会这么铁石心肠。
指对他人过分严厉的、苛刻的。
His father was a hard man.
他父亲是个不讲情面的人。
She is too hard on her assistant.
她对待自己的助手太苛刻了。
指对待他人或对他人的批评非常严厉的、苛刻的。
He suffered harsh criticism from his colleagues.
他受到了同事们的严厉批评。
He received a harsh punishment from his English teacher yesterday.
昨天英语老师严厉责罚了他。
The critics had nothing but harsh words for her new book.
批评家对她的新著只有苛刻的批评。
相关例句：
I'll work hard. I don't want to let him down
我会努力工作，我不想让他失望。
Their work is hard and unglamorous, and most people would find it boring.
他们的工作又累又平淡，多数人会认为很乏味。
That's a very hard question.
那是个很难的问题。
Maybe I just took it too hard.
可能我真的对此事太过耿耿于怀。
It was snowing hard by then.
当时雪下得很大。
The hall porter was feeling hard done by at having to extend his shift.
酒店行李搬运工因为被迫延长当班时间而愤愤不平。