It is simple to be fat but difficult to be strong.
发胖很简单，强壮却很难。
Like most students, when studying at middle school, I found math interesting but difficult, which was a challenge for me.
像大多数学生一样，读中学时，我觉得数学虽有趣但很难，这对我来说是一个挑战。
Foil wrapping paper is beautiful but difficult to use.
锡箔包装纸好看却难用。
Formulas are easy to remember but difficult to use in working out math problems.
公式容易记，但在解决数学问题时却很难应用。
It's easy to go up to a third scale, but difficult to a seventh.
音阶上升三度容易，上升七度就难了。
It was Fantine, but difficult to recognize.
她就是芳汀。已经很难认了。
Starting a new day is always exciting but difficult at the same time.
迎接新的一天既是一件令人兴奋的事，也是一件很难的事。
Hash entries are, similarly to arrays, easy to set but difficult to remove.
散列项类似于数组，易于设置但难以除去。
This problem is more obvious and thus easier to detect, but difficult to explain.
这个问题更加明显一些并且比较容易检测，但却很难解释。
It is easy to learn something about everything, but difficult to learn everything about anything.
对每一件事知道一些是容易的，对任何一件事详细知道是困难的。
Mr. Mortenson's idea for 2011 is a simple one conceptually but difficult to put into practice.
格瑞戈*莫滕森给2011年提出的是个很好明白但很难实践的建议。
This relationship can be wonderful but difficult - like in the story of Prince Llewelyn and his dog Gelert.
人与狗的关系可以很好，但是很难，正如莱维琳和他的忠犬杰乐一样。
As Dr Poore points out, it is easy to undertake to preserve a forest, but difficult to do so in practice.
玻尔博士指出，保护森林说说容易，实际做起来却很难。译者按：beundertaketo do sth。
This is simple (but difficult. makes buggy code easy) work to make them thread-safe (but many efforts are needed).
将其转换为线程安全是一件简单（其实很困难，编写充满bug的代码倒是很简单）的工作（但是需要更多的努力）。
I've noticed that getting the team working as one from the initial phase is an important but difficult task to accomplish.
我已经注意到使这个团队工作起来像某一个在初始阶段那样是非常重要的，但是实现起来却是非常困难。
These range from the sensible, but difficult (tightening ETS allocations) to gimmicks (stricter enforcement of speed limits on motorways).
建议中有些有道理但却很难实施(加紧ets配额)，还有的纯属噱头(在机动车道上对车速进行更严格限制)。
Converse to the question of precision, short pieces of data may be compact but difficult to understand without some external guide or reference.
与精确性问题相反，简短的数据看上去紧凑，但是如果没有外部的指导或参考，将难以理解。
Thus, aggregation is handy but difficult to achieve, since it requires crawling through all the available data sources and scaling the search engine.
因此，聚合的方式非常方便，但是却难以实现，因为它需要通过爬网的方式处理所有可用的数据来源，并且扩展搜索引擎。
He said patent filings by China groups had shot up, especially for utility model or "mini" patents that are relatively easy to obtain but difficult to defeat in court.
他表示，中国企业的专利申请已大幅增加，尤其是实用新型或“微型”专利，此类专利相对容易获得，但在法庭上难以胜诉。
Some puzzles look difficult but are actually quite simple.
有些谜看似很难，但实际上相当容易解开。
It sounds difficult, but compared to full-time work it was a cinch.
尽管听上去很难，但与全职工作相比这简直是小儿科。
It was a difficult task but we brought it off.
那是一项艰难的工作，但我们还是完成了。
That sounds rather simple, but in fact it's very difficult.
那听起来很简单，但实际上非常难。
It was a difficult concept to grasp, but I soon latched on.
那是个难以弄明白的概念，但我很快就理解了。
All teams are beatable, but it's going to be very, very difficult.
所有的团队都能够被打败，但却非常非常的困难。
All teams are beatable, but it's going to be very, very difficult.
所有的团队都能够被打败，但却非常非常的困难。
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