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。
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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