很昂贵的

Firstly, the establishment of model requires sophisticated neurointerventional techniques and costly interventional materials(sacculus, minikin circlip ring, endovascular electrocoagulation), it not only consumed time but also increased the resesrch expense ; Secondly, although the Massoud model is the first successful model that contain the nidus, but it is far from mimicking the high-flow fistulae frequently observed in a brain AVM; Thirdly, the rapid spontaneous thrombosis result in fistula occlusion in a short time;Fouthly, the model's natural course and the long–term patency of fistula are unclear;Currently the model is only used for the short-term research.

但Massoud模型目前存在以下主要缺点：第一，模型的建立需要复杂的神经介入技术和昂贵的介入材料(球囊、微弹簧圈、血管内电凝等)，操作费时，又大大增加了研究费用；第二，Massoud模型虽然首次具备了畸形血管团，但它远不是我们临床上常见的含有高流量动静脉瘘的脑AVM；第三，颈动静脉吻合口自发性血栓形成进而导致引流静脉闭塞的机率很高；第四，Massoud模型的长期自然过程和动静脉吻合口的长期通畅性尚不清楚，目前仅仅作为急性期模型。

In the process we followed seven principles listed below.1 Through clinical and laboratory research, the selected formula is demonstrated to have an obvious efficacy on a target disease—definite efficacy, superior to western medicines.2 Have no or little side effect—safely use.3 On selecting formulae, place priority to treatment basing on an overall analysis of the illness, and then to discriminatingly use of medicines for the convenience of promoting products in the north America.4 Contain no components prohibited by FDA or —accord with laws.5 Composition of herbs is relatively simple; selected herbs have abundant herbal resources; avoid using rare and costly components.6 Broadly recognized, have formal quality standards.7 Little repeat among selected formulae.

我们在筛选广济药业出口中药的处方时，依次遵循以下七条原则：其一，该处方经临床和实验研究证明对目标疾病具有显著的治疗效果—疗效确切，与西药同比具有优势；其二，无毒副作用或毒副作用很小—使用安全；其三，处方选择以辨病施治为主，辨证使用为辅，以方便在北美地区的推广应用；其四，无美国FDA及濒危野生动植物保护委员会禁用的成份—合乎法律；其五，药味组成相对简单，药材资源丰富，避免使用特别冷僻和昂贵的成份；其六，受公认程度较高，有正式质量标准；其七，被选中的处方之间重复性小。

PC Magazine concluded that the MacBook 13-inch is Apple's most affordable Intel-Mac notebook, and I'm happy to see it carries over so many of the features and Intel components from the more expensive MacBook Pros.

PC杂志的结论是，的MacBook 13英寸的是苹果的最经济实惠的英特尔的Mac笔记本电脑，我很高兴看到它，如此众多的功能和英特尔组成部分，从较昂贵的MacBook的利弊。

Tian Han said, in general, the composition of groups of foreign nationals, including embassy personnel, foreign investors and senior management personnel, because a few years working in China will be the rotation group of people, so they usually do not buy a house, together with high subsidies, so they tend to rent with the families of high-quality, expensive high-end rental apartments; At the same time, some senior managers in foreign invested enterprises, desire to live in an atmosphere of high-quality, independent apartment of this overall environment has also shown very strong interest.

田汗说，一般而言，团体组成的外国公民，包括使馆人员，外国投资者和高级管理人员，因为在几年的工作将在中国的轮换一批人，所以他们通常不买房子，加上高额补贴，因此他们往往租金与家庭的高品质，昂贵的高档公寓出租，同时，一些高级管理人员在外商投资企业，都渴望生活在一个大气的高品质，独立公寓的整体环境也显示出很强的兴趣。

Michael Pollan Talks About What We Should Eat: A video of Pollan, espousing his Eat Food, Not Too Much, Mostly Plants message, in which he explains that eating well is expensive, because the industrial food system is heavily subsidized and externalizes the environmental, animal welfare and disease costs that result from its operation.

麦可·朴伦谈到我们应该吃些什么：在他的一段视频中，朴伦支持&要吃好的食品、不能吃太多、大部分食品是植物的&观点，他解释说，吃好是昂贵的，因为工业化食品加工系统获得很高的津贴并且在运营中使环保、保育动物和预防疾病的成本具体化了。

That may not be much of a margin for two products with such drastically different prices, but I was struck by how the best-informed people at the show -- like John Atkinson and Michael Fremer of Stereophile Magazine -- easily picked the expensive cable.

这种区别或许难以和两者天壤之别的价格划上等号，不过我对于展览会上最懂行的人物──比如约翰·阿特金森和《音响专家》的迈克尔·弗雷默──轻而易举地选出了价格昂贵的音响线很是惊奇。

The cost of a head mounted display and a dataglove was very high, so low cost systems gave up on the idea of true immersive virtual reality and concentrated on giving the perception of depth to 3D scenes, usually by synchronizing the display of a normal monitor with a pair of shutter glasses which blanked out each eye in succession.

头戴式显示器和数据手套都很昂贵，于是低成本系统就放弃了这些真正的完全的浸入式虚拟现实，而集中在提供3D场景的深度感知上，通常使用一对能够遮住眼睛的眼镜在普通显示器上合成这种图像。

His concept is that you use the dugs which may induce mutation as early as several months or sometimes several weeks, that's why he has to check the DNA mutations, but there are now some drugs available who are OK for 5 years. If so, why you have to worry about mutation by performing expensive DNA frequency.

Keeffe教授的概念是指如果你所使用的药物是在用药几周或者几个月后就会引起突变的话，在这种情况下就需要检测HBV DNA，而对于5年耐药率都很低的药物来说，就没有必要如此频繁地进行昂贵的检测了。

Every few years,the U.S. geological survey makes an educated guess of the oil avaiable some would be expensive to extract, or politically problematic

每隔几年，美国的地质调查报告都会作出有板有眼的推测：世界上的石油有些抽取会很昂贵，或者是存在政治上的问题

Construction of biologically functional bacterial plasmids in vitro . Proc. Natl. Acad. Sci. USA 70, 3240 – 3244 (1973).^ Patricia S. Thomas, Hybridization of Denatured RNA and Small DNA Fragments Transferred to Nitrocellulose PNAS 1980; 77: 5201-5205 PNAS Keith Roberts, Martin Raff, Bruce Alberts, Peter Walter, Julian Lewis and Alexander Johnson, Molecular Biology of the Cell

一个很典型的例子就是DNA分子大小的测量：在凝胶电泳出现之前，DNA分子大小是用蔗糖密度梯度沉降法来测量的，这一方法费时费力而且花费昂贵；而在梯度沉降法出现之前，使用的是黏度法。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失