例句 1。 The negatively charged region is several hundred meters thick and several kilometers in diameter。 带负电的区域有几百米厚,直径有几千米。
2。 The channel is only a few centimeters in diameter; but it is wide enough for electrons to follow the channel to the ground。 这条通道的直径虽然仅有几公分,但它足以让电子通过通道到达地面。
3。 According to this hypothesis; Earth may collide with an asteroid with an estimated diameter of 10 kilometers。 根据这个假说,地球可能会与直径估计是10千米的小行星相撞。
disclaimer[diskleim?r]n。 免责声明;否认,拒绝
例句 They are asked to sign a disclaimer acknowledging the promising dangers of the activity。 他们被要求签署一份免责声明,承认他们知晓这一活动的潜在风险。
discover[disk?v?r]v。 发现;发觉
例句 1。 Before he discovered that the element was contained in natural gas on Earth; Ramsay found evidence of helium in the spectrum of sunlight。 在发现地球上的天然气含有氦元素之前,拉姆塞在太阳光谱中就发现了氦的迹象。
2。 The biologist who lived longtime in the Pacific Northwest discovered areas where deer had an increase in suitable browse。 那位长期居住在太平洋西北部的生物学家发现,在有适合的牧草的地区,鹿的数量有所增加。
disoriented[dis?:rientid]a。 分不清方向或目标的;无判断力的
例句 1。 He hypothesized that birds orient themselves according to the Suns position as caged birds bee disoriented when the sky is overcast。 他认为鸟类是根据太阳的位置来定位的,因为阴云密布的时候笼中的鸟无法分清方向。
2。 The birds were disoriented and had trouble locating their food box on overcast days。 阴天,鸟类会失去方向感,在找到它们的食盒时也有困难。
要点 disoriented是disorient的过去分词,在托福阅读中比较常用,而动词disorient是“使失去方向感”的含义。
distribute[distribju:t]v。 分配;分类;分区
例句 The wind helps the flowers distribute their seeds and enables birds to find more food。 风不仅能帮助花儿传播种子,而且也让鸟儿有了更多的食物。
同义 scatter; spread(v。 散布)
disturbance[dist?:rb?ns]n。 打扰;骚动;心神不安
例句 1。 They calmed down quickly after disturbances。 骚动之后,他们很快就恢复了平静。
2。 In the early twentieth century; the American ecologist pointed out that plant munities would develop after a disturbance such as volcanic eruption; heavy flood; or forest fire。 在20世纪早期,美国生态学家指出在诸如火山喷发、洪灾或森林火灾之类的干扰发生之后,植物群落会得以发展。
3。 Stability can be defined as the speed at which an ecosystem returns to a particular form following a major disturbance。 稳定性可定义为当一个生态系统经历巨大骚乱后,恢复到特定形式的速度。
同义 interference(n。 打扰);stir(n。 骚动)
divide[divaid]v。 分,分隔;分配 n。 分开;界限
搭配 divide into 把…分成;digital divide 数字鸿沟;divide the work 分工;divide by 除以,用…除;divide up 瓜分;分割;分配
例句 The substances that make up two groups of planets are divided into three groups: gases; rocks; and ices based on their melting points。 组成这两组行星的物质根据它们的熔点被划分成为三种:分别是气体、岩石和冰。
division[divi?n]n。 除;分配;部门
例句 1。 The international division of labor was well…suited to the development of some countries; that is a key factor in their success。 国际劳动分工很适合一些国家的发展,这也是这些国家获得成功的一个关键因素。
2。 All meteorites are assigned to three broad divisions on the basis of two kinds of material。 基于两种材料,所有的陨星一共被划分为三大类。
同义 partition(n。 划分)
drill[dril]v。 钻(孔),打眼;训练
例句 1。 Wells are drilled into the ground; when an oil pool or field has been discovered。 当油池或油塘被发现时,石油钻井会被打入地下。
2。 The first oil well was drilled by the retired railroad conductor — E。 L。 Drake。 第一口油井是由E·L·德雷克钻的,他是一名退休铁路列车长。
同义 bore(v。 打眼);practice(v。 训练)
due[du:]a。 到期的;应给的;应支付的
搭配 due to 由于;due date 到期日,支付日