在英语中，如果定语是由一个单词表示时，通常要前置。而由一个词组或一个句子表示时，通常则后置。雅思阅读中有很多的定语从句或者定于词组。具体内容一起来看剑9雅思阅读中的定语从句或定语词组吧。
一、that引导的定语从句
1. Second, we make a very conservative assumption that we are looking for a life form that is pretty well like us, since if it differs radically from us we may well not recognise it as a life form, quite apart from whether we are able to communicate with it. (剑9 Test 1 Passage 2)
我们先来认识一些单词：
1. assumption(n. 假设，假定)
2. radically(adv. 彻底地;根本地)
句子结构分析：第一个That引导的从句作assumption的同位语，第二个that引导定语从句修饰a life form，since引导时间状语从句，if引导条件状语从句。
译文：第二，我们保守地假定我们正在搜寻的生命形式和人类非常相似，如果形势完全不同，那么我们可能不会把它看作一种生命形式，更不用说能否与它进行交流了。
2. However, when we look at the 100 billion stars in our galaxy(the Milky Way), and 100 billion galaxies in the observable Universe, it seems inconceivable that at least one of these planets does not have a life form on it; in fact, the best educated guess we can make, using the little that we do know about the conditions for carbon-based life, leads us to estimate that perhaps one in 100,000 stars might have a life-bearing planet orbiting it. (剑9 Test 1 Passage 2)
句子结构分析：However，转折连词，when引导时间状语从句， it seems inconceivable that…句式，表示这似乎难以相信……。分号表示并列，表示另一句话，第三个that引导定语从句修饰the little，第四个that引导宾语从句。
译文： 然而，当我们观测银河系中的1000亿颗恒星和可见宇宙中的1000亿个星系的时候，很难相信这些星球中没有一个有生命存在。事实上，凭借我们仅有的一点对碳基生命的了解，我们所能做出的最有根据的推测是，或许每十万个恒星中的一个会有孕育着生命的行星围绕着它运转。
二、which引导的定语从句
1. The variety which is favoured, in this account, is usually a version of the ‘standard' written language, especially as encountered in literature, or in the formal spoken language which most closely reflects this style.
(剑9 Test 3 Passage 1)
句子结构分析： 这句话的主干是The variety is usually a version of the ‘standard' written language 。which引导定语从句修饰The variety，in this account作插入语，especially as做插入语，which引导定语从句修饰spoken language。
译文：这里提到的具有更高价值的语言通常指的是“标准”书面语言，尤其是在文学作品或最能体现这一特点的正式口语中。
2. In the 1940s, he single-handedly created an entire science of communication which has since inveigled its way into a host of applications, from DVDs to satellite communications to bar codes - any area, in short, where data has to be conveyed rapidly yet accurately. (剑9 Test 3 Passage 3)
我们先来认识一些单词：
1. inveigle (vt. 诱骗，诱使)
2. accurately (adv.精确地)
句子结构分析：这句话主干是he single-handedly created an entire science of communication。 Which引导定语从句修饰communication，from DVDs to satellite communications to bar codes 做插入语，破折号后面any area…表解释说明。 in short做插入语，where引导非限制性定语从句修饰area。
译文：20世纪40年代，他一手创立了完整的通信科学理论，随后该理论得到了广泛应用，从DVD到卫星通信，再到条形码——总之，需要快速而又准确传送数据的所有领域都应用到了通信科学。
三、who、whose引导的定语从句
1. Descriptive grammarians have been presented as people who do not care about standards, because of the way they see all forms of usage as equally valid. (剑9 Test 3 Passage 1)
句子结构分析：这句话用的是现在完成时，表示对现在的影响，who引导定语从句修饰people，because of引导时间状语从句。(that) they see修饰the way，that省略。
译文：描述派语法家一直被认为不注重标准，在他们看来，各种用法都同样是合理的。
2. Turning her attention to minerals, she found her interest drawn to pitchblende, a mineral whose radioactivity, superior to that of pure uranium, could be explained only by the presence in the ore of：small quantities of an unknown substance of very high activity. (剑9 Test 4 Passage 1)
我们先来认识一些单词：
1. pitchblende(n. 沥青油矿)
2. ore(n. 矿石)
句子结构分析：Turning作伴随状语，这句话的主干是she found her interest drawn to pitchblende。Whose引导定语从句修饰mineral，superior to that of pure uranium做插入语。
译文：随着居里夫人把注意力转向矿物质，她对沥青油矿产生了兴趣。沥青油矿是一种放射性高于纯铀的矿物质，而其高放射性的唯一解释实在矿石中存在着一种极为稀少却高度活跃的未知活跃。
四、动词V-ing做后置定语
1. Strategies are needed to obtain the optimum classroom construction and perhaps a change in classroom culture and methods of teaching, in particular, the effects of noisy classrooms and activities on those experiencing disabilities in the form of auditory function deficit need thorough investigation. (剑9 Test 2 Passage 1)
我们先来认识一些单词;
1. optimum (adj. 最佳的)
2. auditory (adj. 听觉的)
3. thorough (adj. 彻底的，十分的)
句子结构分析：这句话的主干是Strategies are needed to obtain…and perhaps a change…in particular，the effects of noisy classrooms and activities…noisy classrooms and activities。in particular做插入语，those指代children，experiencing作后置定语修饰those。
译文：因此，需要采取措施来获得最佳的课堂建设，也许还需要改变课堂文化与教学方法，特别要彻底检查吵闹的课堂与活动给患有听觉功能障碍的孩子带来影响。
五、动词V-ed作后置定语
3. During World War 1, Marie Curie, with the help of her daughter Irene, devoted herself to the development of the use of X-radiography, including the mobile units which came to be known as little Curies', used for the treatment of wounded soldiers. (剑9 Test 4 Passage 1)
句子结构分析：with the help of做插入语，这句话的主干是Marie Curie devoted herself to the development of the use of X-radiography。Which 引导阅读从句修饰the mobile units， including做伴随状语，used for作定语修饰little Curies。
译文：第一次世界大战期间，居里夫人在女儿Irene的帮助下，投身于X射线照相技术的发展研究，其中包括被称为“小个子居里”的治疗伤员的流动设备。
上面就是对雅思阅读中常见的定语从句或者非谓语作后置定语的句子分享，希望对雅思阅读中隐藏的定语从句更加了解。最后，预祝大家雅思考试取得好成绩。
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