Teeth have a hard surface layer called enamel.
牙齿有一层叫做釉质的坚硬表层。
By then, Steve was having a hard time remembering the names of some of his friends.
那时，史蒂夫已经很难记住一些朋友的名字了。
I'm supposed to do a literature review for my psychology course, but I'm having a hard time finding articles.
我应该为我的心理学课程做文献回顾，但是很难找到文章。
A conclusion has been drawn from many experiments that anumeric people have a hard time distinguishing quantities.
从许多实验中得出的结论是，（语言中）没有数词的人很难区分数量。
He gave her a hard push which toppled her backwards into an armchair.
他给了她用力的一推，将她向后推倒在一把扶手椅上。
A hard-core group of right-wing senators had hoped to sway their colleagues.
一群骨干右翼参议员曾企图左右他们的同事。
Propolis is a hard resinous substance made by bees from the juices of plants.
蜂胶是蜜蜂用植物汁液合成的像树脂一样的坚硬物质。
In a hard-hitting speech to the IMF, he urged Third World countries to undertake sweeping reforms.
在向国际货币基金组织所作的一次一针见血的演讲中，他敦促第三世界国家进行全面改革。
Her grandmother has had a hard life.
她的祖母过着艰难的生活。
What a hard-working boy Zhou Bin is!
周斌是一个多么勤奋的男孩啊！
Being a journalist is a hard but great job.
记者是一份艰难却伟大的工作。
It was a hard hit, but his influence stayed.
这是一个沉重的打击，但他对我的影响仍然存在。
They lived a hard life and fought against the enemies.
他们过着艰苦的生活，与敌人作战。
"I am having a hard time," the young man said.
“我现在过得很艰难。”年轻人说。
Though the girl lives a hard life, she never feels sad.
虽然这个女孩过着艰难的生活，但她从不感到悲伤。
When he was young, he and his mother had a hard life.
当他年轻的时候，他和他的母亲过着艰难的生活。
It's a hard job, but he works hard to support the family.
工作很艰苦，但他依旧努力工作挣钱养家。
When I was young, my family led a hard life in the country.
在我小时候，我们家在乡下过着艰苦的生活。
Chester felt more tired than usual after a hard day at the office.
在办公室辛苦工作了一天之后，切斯特觉得比平时更累了。
It's been a hard year, but I'm getting better, though it takes time.
这是艰难的一年，但我正在好起来，尽管这需要时间。
It drinks juice from tree roots and it is covered in a hard shell.
它喝树根的汁液，并且有一层硬壳覆盖着。
The Little Match Girl makes me feel sad because she lives a hard life.
《卖火柴的小女孩》的故事让我感到难过，因为她过着艰难的生活。
The local people used to live a hard life because of the shortage of water.
因为缺水，当地人民过去过着艰难的生活。
If something happens to your ears, you might have a hard time telling different tastes.
如果你的耳朵出了问题，你可能很难分辨出不同的口味。
I had a hard time reading a few pages, and then I decided to give up.
我很艰难地读完了几页，然后我决定放弃。
With a hard job in a factory, he doesn't find much time to visit his hometown.
由于在一家工厂工作很辛苦，他没有太多时间回老家。
Do you know twenty to thirty percent of teenagers in the US have a hard time going through the period?
你知道在美国有百分之二十到三十的青少年在这个时期都过得很艰难吗？
Building such a bridge over the bay was a hard nut to crack but the local government made it within two years.
在海湾上建造这样一座桥是一件困难的事情，但当地政府在两年内完成了。
I hope kids can understand that teachers push them to do their best and not just to give them a hard time.
我希望孩子们能理解，老师是在督促他们做到最好，而不是让他们不好过。
He wrapped me in his arms and said, "Son, your mom spent a hard day at work today and she's really tired."
他把我搂在怀里说：“儿子，你妈妈今天辛苦工作了一天，真的很累了。”
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