If you're used to a very relaxing class, learning to develop in a strict environment is difficult.

如果你已经习惯了氛围轻松的课堂环境，那么在严肃的氛围下学习就会变得很困难。

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This is very difficult because there are no high ladders and pressures from day-to-day work you get very much in the way of learning.

这很困难，因为学习不能一步登天，而巨大的工作压力，还存在于学习的每一天。

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Unfortunately for Brown, who used mathematic and logic models to build the language, the experiment failed in that people actually had a very difficult time learning the artificial tongue.

Brown应用了数学和逻辑模型来建立这门语言，但结果很不幸实验失败了，实验对象在学习这门一个人造出来的语言时感到无比困难。

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"When it rains it comes in everywhere and sometimes we have to close the classroom and move the students and it does interrupt their learning and it is very, very difficult, " says Ms Raffee.

BBC: School rebuild joy turns to frustration

Mr. Felice: I didn't find it very difficult because I enjoyed learning about the differences.

WSJ: Managing in Asia: Dell Goes Local; Steve Felice

Creating software that can write long-form narratives is very difficult, full of all sorts of interesting artificial intelligence, machine learning and natural language problems.

FORBES: An Author Turns to Software to Take the Tedium out of Writing