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。
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。
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。
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。
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。
But having had a difficult life gives you unusual lessons and develops courage.
但是经历过艰难的生活会给你不同寻常的教训，并培养你的勇气。
It's very easy to fall into the habit of smoking, but extremely difficult to get rid of it.
要养成吸烟习惯很容易，但要戒掉却极其困难。
You can train it to flap its wings to escape a situation but it's very difficult to get it to flap its wings for food.
你可以训练它扇动翅膀以逃避某种情况，但要让它扇动翅膀获取食物是非常困难的。
The researcher noted that the dolphin is quite eager to press the paddle when it was sure of the answer, but exhibited hesitation during difficult trials.
研究人员注意到，海豚在确定答案时会很着急地按下踏板，但在难度高的测验中则表现出犹豫。
Keeping is harder than winning.; To start a business is difficult, but to keep it going is more difficult.
创业难守业更难。
But as the work became more difficult, the students with a growth mind-set showed greater persistence.
但随着作业难度的加大，具有成长型思维模式的学生表现出了更强的毅力。
Not only are mothers not paid but also most of their boring or difficult work is unnoticed.
母亲们不仅得不到报酬，而且所干的乏味艰辛的活儿也很少被留意。
In actuality, Ted did not have a disorder but merely a difficult temperament.
事实上，特德并没有什么异常而只是脾气不好。
We all know that it's easy to follow fashion but rather difficult to establish our own style.
我们都知道很容易追随潮流，但很难建立自己的风格。
Think about the times you felt tricked or frustrated by a membership or subscription that had a seamless sign-up process but was later difficult to cancel.
想想那些你感到受骗或懊恼的时刻：某会员身份或订阅服务注册过程中畅通无阻，但随后却很难取消。
We had planned to visit the Beijing Expo, but the tickets were too difficult to buy.
我们原计划去参观北京世博会，但是票太难买到了。
Speaking to a group can be difficult, but a bad speech is truly a tiresome task.
面对一群人演讲可能很困难，但是一场糟糕的演讲真的是个令人讨厌的活儿。
These methods may be useful for a while, but it is difficult to solve this problem completely.
这些方法可能暂时有用，但要完全解决这个问题是很困难的。
These methods may be useful for a while, but it is difficult to solve this problem completely.
这些方法可能暂时有用，但要完全解决这个问题是很困难的。
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