These ideas are easy enough to understand, but more difficult to practice. But it just takes practice.

这些经典文章通俗易懂，可实践起来更加不易。

youdao

A more flexible (but more difficult to implement) mechanism is to dynamically discover appropriate data sources.

较灵活(但是更难于实现)的机制是动态发现适当的数据源。

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Unschooling is easier for parents because they need not plan lessons or grade tests but more difficult in that learning is ever-present and collaborative.

非学校教育方式对于家长而言比较容易实施，因为家长不必制定课程计划，也不用搞什么升学考试。对家长而言，难的是如何保持学习的新鲜感并得到孩子的配合。

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But making the vaccine more widely available especially in rural areas has been difficult.

VOA: special.2009.11.03

Now the intervention studies are stronger methods than the epidemiology studies but they're also more difficult studies to do.

相比传染病学研究,干预性研究更有效,但也更难执行

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But I want you guys to think about why it was difficult to do it another way, which is more pedestrian.

但是我希望你们能思考一下,为什么用另一种更普遍的方法来做,反而会比较难呢

耶鲁公开课 - 基础物理课程节选

Yet as Wal-Mart makes more of those purchases in the less-served, but more difficult states, growth will inevitably slow.

ECONOMIST: Wal-Mart

Though the U.K. version was printed in broadsheet format for 200 years, it switched to compact size in 2004, making it handier for reading on trains and buses--but more difficult to roll up for use as a fly-swatter.

FORBES: Magazine Article

It's difficult on a personal level, but even more difficult because of the larger impact in the Senate and also the nation.

CNN: Transcript: Jeffords statement