这是一个困难的问题。
The decision to search for birth parents is a difficult one to make.
作出寻找亲生父母的决定是困难的。
Curiosity, he argues, is the third key factor—and a difficult one to preserve.
他认为，好奇心是第三个关键因素，也是一个很难保持的因素。
But the problem is a difficult one to solve.
但这是一个难以解决的问题。
The question before us is a difficult one.
我们面前的问题是一个困难的问题。
The final exam will be a difficult one.
期末考试将会很难。
We come again with a difficult one, ok?
我们再来一首难点的，好吗？
AA: Yes, this away game is going to be a difficult one.
是的，这场客场比赛将是一场艰苦比赛。
It's a difficult one. I think it's a good quote as well.
这是一件难事，我也认为这是一个好的引用。
This is a difficult one (and probably is for everyone), but it's essential for me.
这一点很难(大概对每个人来说都一样)，可是对我来说必不可少。
Word teaching in Junior middle school English is not only a key point, but also a difficult one.
单词教学在初中英语教学中既是一个重点，又是一个难点。
Word teaching in Junior middle school English is not only a key point, but also a difficult one.
单词教学在初中英语教学中既是一个重点，又是一个难点。
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