做到这一点既十分简单，又困难重重。
This is one of those wildly simple yet agonizingly difficult things to accomplish.
我们知道这将会是又长又困难的系列。
这项计划又困难又危险，但我们终于完成了。
在工科数学教学中加强应用教学既迫切，又困难。
It is urgent and difficult to reinforce the application-oriented teaching of mathematical application at present.
我有困难的时候他会帮我，而他又困难我也会尽力帮他。
工程索赔在工程管理中既重要又困难，它是经验型的工作。
Construction claim, which is characterized by experience, is important and difficult.
例如，如果我在学习上又困难，我就能上网搜索一些有帮助的信息。
For example, if I have some trouble studying, I can surf the Internet to find more helpful information. And I can make more friends on it.
例如，如果我在学习上又困难，我就能上网搜索一些有帮助的信息。
For example, if I have some trouble studying, I can surf the Internet to find more helpful information.
骤降的天坑、分层的城市和陡峭的悬崖使探索偏远的尤塔帕星球变得既危险又困难。
With its plunging sinkholes, layered city levels and sheer cliff-faces, the remote world of Utapau can be difficult and hazardous to navigate.
如果在这个体式上放松和打开肩膀又困难，用瑜伽砖或金属折叠椅的座位支撑手离开地面。
If you have difficulty releasing and opening your shoulders in this pose, raise your hands off the floor on a pair of blocks or the seat of a metal folding chair.
乡村地区往往没有好的水源，因为开凿深水井既昂贵又困难，而浅水井的水又通常很浑浊。
Rural areas often lacked good water because deep wells were expensive and difficult to build, while the water from shallow wells was usually cloudy.
弧齿锥齿轮广泛用于肮空传动，作为直升机的关键零件，其啮合质量的控制是一个既重要又困难的课题。
Spiral bevel gears are widely used in aviation transmission. As key components of helicopter, controlling their meshing quality is an important and difficult problem.
例如，如果我在学习上又困难，我就能上网搜索一些有帮助的信息。并且我还能够在网上交到更多的朋友。
For example, if I have some trouble studying, I can surf the Internet to find more helpful information.
建造一艘航空母舰既困难又昂贵。
由于他在1981年镇压了一场未遂政变，多年以来他受到了西班牙人不可否认的追捧，但在此之后，他最近又面临着更困难的时期。
But after years of undeniable adulation among Spaniards for putting down an attempted coup in 1981, he's recently faced more difficult times.
对于有些用户来说，这非常容易，而对于另外一些用户来说，又非常困难，或者几乎不可能。
For some users this could be very easy, and for others, it could be very difficult, or almost impossible.
是的，锻炼自控能力会是既困难又乏味的，但是实际上它可以带给你很多不那么乏味的、从避免上医院到有能力负担自己的房子之类的奖励。
Yes, exercising self control can be both difficult and boring, but it actually has many not-so-boring rewards, from staying out of the hospital to being able to afford your own home.
梅格沉思着说，”这其实就是追求善美，只是说法不同而已，而这个故事可以启发我们，因为尽管我们都有追求善美之心，但因为做起来困难，我们便又忘掉了，不去尽力而为。
It is only another name for trying to be good, and the story may help us, for though we do want to be good, it's hard work and we forget, and don't do our best.
尽管与计费程序包集成是最有吸引力的解决方案，但是这对于IT人员来说不是非常受欢迎的，大家都认为这种方法即困难又昂贵。
Although integrating with an accounting package is the most attractive solution, it is not very popular with it staff because it has a reputation for being difficult and expensive.
在我每次试图戒烟失败后，我都感到既虚弱又无比自责，同时对自己克服这种困难的能力持怀疑态度。
Each time I failed in my quit attempt, I felt guilty and weak and unsure of my ability to overcome such difficult hurdles.
回答这些问题确实既困难又尴尬，不过这么做可以免去你永无止境的头疼和误解。
These can be difficult and awkward questions to ask, but will save you great heartache and misunderstanding down the line.
可是，治疗背部疼痛既非常困难又十分昂贵。
But back pain is notoriously difficult, and expensive, to remedy.
另一种描述场景的方法是列出它的所有步骤，但是这种方法既困难又未必详细。
Another way to describe a scenario is to list all the steps in it, but this is both more difficult and unnecessarily detailed.
大多数单亲发现独自照料一个家很困难，因此他们很快又结婚，形成再婚家庭。
Most single parents find it very difficult to take care of a family alone, so they soon marry again and form remarried families.
在结婚+抵押贷款+生小孩之前，我在又长又有困难的高尔夫球道上遇到6或7个障碍。
Before marriage + mortgage + kids, I played to a 6 or 7 handicap on a long difficult golf course.
人类史上一个反复想过又抛弃了的困难时期。
这时，河里那个人已经呼吸困难，而且又呛了好几口水， 于是他说：「好啦！
By now the man in the river was trying very hard to breathe and was even swallowing some of the river water.
这时，河里那个人已经呼吸困难，而且又呛了好几口水， 于是他说：「好啦！
By now the man in the river was trying very hard to breathe and was even swallowing some of the river water.
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