Your writing is really difficult to read.
你的笔迹真是难以辨认。
Everything else is really difficult to do experimentally.
其他的很难通过实验做到。
PW: It is a balance, and this is really difficult.
这需要一种平衡，而且的确不易。
Chinese is really difficult. But thanks for the compliment.
中文真的很难学。谢谢你的夸奖。
Nothing is really difficult in the world as long as you work hard.
世上无难事，只要有心人。
This topic is really difficult.
这个话题真的很难。
As you can imagine, the exam is really difficult.
你可以想象到，考试相当难。
It is really difficult to be used to being alone.
习惯一个人，是艰难的。
It is really difficult for US to grant your request.
要我们答应你们的要求的确很困难。
It is really difficult for me to associate the two ideas.
对我来说把这两个观点联系起来很困难。
It is really difficult to guess Confucius' will at his old age.
孔子晚年的心志如何，的确多费猜疑。
To be a successful member of this committee is really difficult.
到现在为止，要成为这个团队中成功的一员非常不易。
It is really difficult to learn English without language environment.
没有语言环境学习英语的确是困难的。
We can see from his puzzled look that the problem is really difficult.
从他困惑的表情上我们可以看出，这个问题的确很棘手。
However, for aircraft design, it is really difficult to realize multidisciplinary optimization.
然而要实现飞机综合优化设计却绝非易事。
However, for aircraft design, it is really difficult to realize multidisciplinary optimization.
然而要实现飞机综合优化设计却绝非易事。
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