But the cephalic veins are sometimes difficult to isolate.
但部分患者分离头静脉存在困难。
It is sometimes difficult to disentangle truth from falsehood.
从虚假中解开事实有时是困难的。
It is sometimes difficult to determine the right thing to do, but many firms are trying.
有时很难决定怎样做才对，但是许多公司在努力做好。
Although these two goals are not opposites, they are sometimes difficult to reconcile.
虽然这两个目标不是对立的，但是两者有时很难协调。
And of course the utility would love to make electricity in the process which is sometimes difficult.
当然，实用程序会制造出电，在一个有时是困难的过程中。
Distention from ascites (Fig. 148-3) is sometimes difficult to differentiate from truncal obesity.
腹水的膨隆(图148-3)有时难以同躯干性肥胖鉴别。
And having lost that clarity it's sometimes difficult to focus on who's the enemy, what's the ill here.
一旦丧失了这种明确性，那些时候再去关注谁是敌人就很困难，这也就是不利的地方。
It is sometimes difficult to tell a well-differentiated follicular carcinoma from a follicular adenoma.
有时很难区分分化好的滤泡状腺癌与滤泡状腺瘤。
It is sometimes difficult to distinguish between the element of envy itself and the defences against it.
有时候很难区分哪些是嫉羡的防御，哪些是嫉羡本身。
We understand that it is sometimes difficult to meet debts, especially at this very expensive time of year.
我们能够理解，偿付债务有的时候会遇到一些困难，特别是在这个一年中开支很大的时候。
Sichuan dialect sounds much the same as Hubei dialect. It is sometimes difficult to tell one from the other.
四川话和湖北话在北方人听起来很相似，有时难以区别。
The poetry of Ezra Pound is sometimes difficult to understand because it contains so many obscure references.
艾兹拉·庞德的诗有时候难以理解，因为诗歌中含有许多令人费解的典故。
But for the most part, SOA has remained a set of patterns and best practices, sometimes difficult to implement.
但是在极大程度上，SOA依旧是一组模式和最佳实践，有时难以实现。
It is — and this is putting it mildly — sometimes difficult to generalize about a nation of 1.3 billion people.
概括描述一个有13亿人口的大国有时候挺不容易，这还是比较温和的说法。
However, this is not always the case, and it is sometimes difficult to distinguish between subsystems and localities.
然而这并不是一成不变的，而且有时也很难区分出子系统和位置。
Good design requires an enormous amount of creativity, and let's face it, getting the juices flowing is sometimes difficult.
好的设计要求大量的创意。有时候做到立足现状，顺其自然并不容易。
This article lists my top ten tips for navigating the sometimes difficult path toward successful ClearQuest implementations.
本文列举了我克服苦难并成功实施ClearQuest的十个技巧。
Genetic testing often reveals tantalizing but incomplete information, and it is sometimes difficult to know how to respond.
基因测试经常揭示出一些让人心急但又不完备的信息，人有时也难以知道如何对这些信息作出回应。
Speaking a foreign language is sometimes difficult because we may not understand the non-verbal signals of another culture.
有时候说一门外语很难，因为我们可能不理解另一文化的非语言信号。
We don't think of pregnancy as an illness, merely a phenomenal process that has many wonderful and sometimes difficult stages.
我们不认为怀孕是一种病态，仅是一种现象，这个过程有许多十分美妙和有时困难的阶段。
Ms Blohowiak and her colleagues disagreed, deciding not to use the new font because it was sometimes difficult to read on screen.
Blohowiak和她的同事不同意此观点，决定不使用这种新字体，原因在于该字体在电脑屏幕上有时难以辨认。
The changes are gradual, and sometimes difficult to see, but they are going on around you all the time, even as you read these words.
要知道，转变是逐步的，有时候甚至难以被看到，但是这些变化一直在你们周围发生着，甚至在你们读这些话的时候。
Ruby on Rails is sometimes difficult to describe succinctly because it includes so many things. Ruby on Rails (hereafter referred to as Rails) is
Rubyon Rails有时候很难予以简洁地描述，因为其中包括如此多的东西。
Societies offer a great chance to meet people from outside college, which, especially for arts students, is something it is sometimes difficult to do.
社团使人们有大量的机会结识校园以外的人，特别对于文科学生来说，这是难能可贵的。
Since then, despite leaks about the project's sometimes difficult progress, Apple executives have refused to admit that the automotive initiative exists.
此后，尽管有时传出该项目进展艰难的消息，但苹果高管一直拒绝承认汽车项目的存在。
While it's sometimes difficult or impossible to not to get sick when everyone else is, do what you can (take vitamins, wash you hands, etc.) to prevent it.
虽然当每个人都生病的时候有时很难或者不可能不生病，但是你可以尽一切可能(服用维生素、洗手等等)来加以预防。
There are many different versions of widgets and gadgets currently on the market, so it's sometimes difficult to understand how the different technologies compare.
目前市面上有许多不同版本的Widget和Gadget，所以有时很难分辨这些技术之间的区别。
There are many different versions of widgets and gadgets currently on the market, so it's sometimes difficult to understand how the different technologies compare.
目前市面上有许多不同版本的Widget和Gadget，所以有时很难分辨这些技术之间的区别。
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