They are pushed hard to study for good grades.
他们被督促努力学习以取得好成绩。
It is hardly surprising that something called dark energy is hard to study. It is important, though.
一种叫暗能的东西很难研究，这并不足为奇，尽管它很重要。
This is not a new suggestion, but brain cancer is rare, and its rarity makes it hard to study systematically.
这个提议并不新鲜，但脑癌是罕见的，这使做系统研究变得很难。
Luck is hard to study, and yet scientists have uncovered the startlingly large role chance plays in love and work.
尽管很难去研究运气这东西，但是科学家们已经发现机遇在工作和恋爱中发挥着惊人的影响力。
Is it hard to study in your spare time?
在你课余时间学习很难吗？
We consider it hard to study English well.
我们认为学好英语很难。
Isn't it hard to study and work at the same time?
一面念书一面工作不是很辛苦吗？
Yes, of course. So I must try hard to study Chinese.
当然想。所以我要努力学习汉语。
It is hard to study English well if you don't work hard.
如果你不努力的话，学好英语是很难的。
I'm finding it hard to study while the children are playing outside my room.
当孩子们在我的房间外面玩耍时，我很难静下心来学习。
One key reason is that people use their cell phones, by definition, in ways that make them hard to study.
按定义，一个关键的理由是，人们使用手机的方式使得研究比较困难。
For Xie, the piano was a surprising gift - she had never played the piano before and she is trying hard to study how to play.
对谢桂枝来说，这架钢琴是一份令人惊喜的礼物。之前从未弹过钢琴的她目前正在努力学习。
Although animal studies suggest that it does, Dr. Colditz said, "it's hard to study in humans because so few people lose weight and keep it off."
虽然动物研究的结果显示可以，但寇迪兹博士表示：“我们很难对人类进行研究，因为减重又保持不复胖的人太少了。”
It was hard to study regularly at the beginning: Reading books and using a dictionary were not "normal activities" for her. And every English sentence was a challenge.
一开始很难做到有规律地学习：读书并使用字典对于她来说不是一个“平常的行为”，每一个英语句子对于她来说都是一种挑战。
It was hard to study regularly at the beginning: Reading books and using a dictionary were not "normal activities" for her. And every English sentence was a challenge.
一开始很难做到有规律地学习：读书并使用字典对于她来说不是一个“平常的行为”，每一个英语句子对于她来说都是一种挑战。
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