| 单词 | cross section |
| 释义 | cross section横截面【化】 截面; 横截面; 变截面; 断面【医】 横断面, 横切面 cross section cross section 也作 cross-sec.tion AHD: [krôs“sµk“sh…n, kr¼s“-] D.J. [6kr%8s6sek.*n, 6krKs-]K.K. [6kr%s6sWk.*n, 6kr$s-]n.（名词）1. A section formed by a plane cutting through an object, usually at right angles to an axis.横断面：由一扁平物横切某物，通常与轴线成直角切割形成的断面2. A piece so cut or a graphic representation of such a piece.截面图：按此法切割而成的一个断片或表示这一断片的图画3. Physics A measure of the probability of an encounter between particles that will result in the occurrence of a particular atomic or nuclear reaction.Also called collision cross section 【物理学】 有效截面：能引起某一原子或核反应的粒子间碰撞机率的一种度量也作 collision cross section4. Statistics A sample meant to be representative of a whole population.【统计学】 典型，例子：能够体现整个调查对象特点的样品5. Informal A variety; a diversity.【非正式用语】 多样化；多样性继承用法:cross“-sec“tional AHD: [krôs“sµk“sh…-n…l, kr¼s“-] （形容词）用法:Informally, one can speak of across section of a population even if the group chosen is not statistically representative of the population as a whole. Thus it is possible to sayYou meet a cross section of Americans when you travel by interstate bus, even though it is clear that some types of Americans are likely to be underrepresented among the interstate bus-riding public.Whencross section is used in reference to the samples used in surveys and other investigations, however, the presumption is usually that the group has been chosen so as to be representative of the larger population.Thus in the sentenceWe interviewed a representative cross section of moviegoers, the phraserepresentative cross section was found to be redundant by 84 percent of the Usage Panel. See Usage Note at redundancy 在非正式场合，即使被选中部分在数据上不能代表整体水平，也可以说是某一整体的cross section 。 因此可以说：当你乘坐州际公共汽车旅行时，你可以遇上典型的美国人 。 虽然如此，但是很明显在那些乘坐州际公共汽车的美国大众中有几类美国人极有可能没有被完全代表。然而，当cross section 被用来指用于测量或其它调查中的实例时， 通常认为被选中的群体是为了代表更大的整体。因此在下列句子中：我们采访了一群有代表性的电影观众的典型， 短语representative cross section 被84%的用法专题小组成员认为是累赘的 参见 redundancy |
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