这很难确定。
To be a good doctor has always been a dream to me, and I will study hard to make sure that my dream will come true in the future.
成为一名医生一直是我的梦想，为了将来能实现梦想，我会努力学习。
I'm sure he'll continue working very hard trying to be perfect.
我肯定他还会继续刻苦地工作，想办法做得十全十美。
Sure, it'll be hard to get started.
当然，一开始会有些难。
To be sure, the success or failure of most branding campaigns is hard to measure.
可以肯定的是，大部分的成功或失败的品牌宣传活动是很难衡量的。
Be sure to study hard for that test!
一定要为了考试而刻苦学习啊！
However hard the work may be, we are sure to finish it.
不管这个工作多么难，我们有信心完成它。
Son, I know you have to work hard to be successful, but make sure you spend as much time with your family as possible.
儿子，我知道你为了成功得努力工作，但你一定要尽量多花时间陪陪家人。
This must be so hard for you. I'm not sure what to say but I want you to know I'm here for you.
我知道你肯定非常难受。我不知道该说些什么，你只要知道我一直都在你身边。
Work may not be as good as love to make your heart beat, but at least you can guarantee that there is food to eat, have a house to live, and not sure love can not give these, so work hard.
工作也许不如爱情来的让你心跳，但至少能保证你有饭吃，有房子住，而不确定的爱情给不了这些，所以，认真努力的工作。
So I want to really try hard, and I'm sure I'll be able to learn it.
所以，我想要我只要努力学习，就一定能学得好。
I now believe that if I work hard, I am sure to be admitted to a university.
如今我相信，如果我努力学习，我一定能被大学录取。
Can be sure that the phone is for everyone to live in hard to break away part of it.
能肯定的是手机是每个人生活中难以割舍的一部分。
To achieve this condition, I keep telling myself: Be sure to study hard.
为了达到这个条件，我不时地告诉我自己：一定要刻苦读书。
He is clever, to be sure, but not very hard-working.
他聪明是聪明，但是不怎么勤奋。
Most importantly, I must be able to work hard. I am sure I can do it well.
尤为重要的是，我必须努力学习，我相信我能做到这些。
一定要好好学习。
一定要好好学习。
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