Do you have any difficulties while studying?

你在学习中有什么困难吗？

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He later worked on similar jobs across the length and breadth of England, all the while studying the newly revealed strata and collecting all the fossils he could find.

后来，他继续从事相似的工作，足迹遍布整个英国；与此同时，他不断研究那些新近露出的地层，并且收集所有能找到的化石。

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Ray will earn his keep on local farms while studying.

学习期间，雷将在当地农场挣取生活费。

《柯林斯英汉双解大词典》

While studying warships, Fuller realized that they weighed much less than buildings, yet were able to do much more.

VOA: special.2010.05.30

What do you do when you're stuck with a question while studying Physics?

当你在学习物理时被一个问题难倒了怎么办？

学习和交际都重要 - SpeakingMax英语口语达人

These won't be graded, you don't have to turn them in, it's just to give you some extra practice if you want while you're studying for the exam.

这些题目不会记分，你们也不需要交上来，只是如果你需要的话，这可以让你,在准备考试的过程中得到更多的训练。

麻省理工公开课 - 化学原理课程节选

She has also worked as a reporter for the BBC while studying in United Kingdom.

CNN: About

While studying at Indiana University, he went to Cairo for a year on a study-abroad program.

CNN: Seeds for year-old Egyptian revolution sown long ago

In 1967, while studying in Hamburg, she found herself sculpting with fibreglass and polyester.

ECONOMIST: Rebecca Horn