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of a thousand uses。 因此,他把低效且有使用限制的泵转化成了一个多用途的蒸汽发动机。
2。 The sequoia tree could pump water to its very top; which is more than 100 meters above the ground。 红杉树能把水抽到离地100多米高的树顶位置。
pure[pjur]a。 纯净的;完全的;抽象的
搭配 pure gold 纯金
例句 If this theory was correct; breathing air with extra carbon dioxide should have triggered yawning; meanwhile breathing pure oxygen should have suppressed yawning。 如果这个结论正确,那么吸入含有多余二氧化碳的空气就会让人打哈欠,而呼吸纯氧应该会抑制哈欠。
派生 purely(ad。 纯粹地;仅仅)
radiation[?reidi'ei?n]n。 放射;辐射
搭配 radiation safety 辐射安全;solar radiation 太阳辐射;radiation therapy 放射疗法
例句 1。 In most cities; the heating that resulted from solar radiation is enhanced by carbon dioxide。 在大多数城市,太阳辐射带来的加热作用会被二氧化碳增强。
2。 Because it is long been exposed to the intense tropical sun; the grass mouse has also developed two separate safeguards against the sun's ultraviolet radiation。 由于草鼠长时间暴露在强烈的热带阳光下,它演化出了两套独立的预防措施来抵御紫外线辐射。
random['r?nd?m]a。 随机的;任意的 n。 随意
搭配 at random 随意地,任意地
例句 1。 Succession is influenced by lots of factors: the nature of the soil; exposure to sun and wind; regularity of precipitation and many other random processes。 演替会受到多方面因素的影响:比如土壤的特性、风吹日晒、降水规律,以及许多其他的随机过程。
2。 At high altitude; the effect of gravity is random。 在高海拔的地方重力影响是任意的。
同义 arbitrary(a。 任意的)
rate[reit]n。 率,比率;速度
搭配 at any rate 无论如何,至少;at the rate of 以…速度
例句 1。 It relies on the rate at which water enters the lake; and that relies on the rainfall and the evaporation rate。 这取决于水流入湖中的速率,而这又取决于降水量和蒸发率。
2。 Freight trains have an accident rate that is only one third that of the trucking industry。 货运火车的事故率仅是卡车运输业的三分之一。
ratio['rei?iou]n。 比,比率
例句 In order to pare the positions of a meteorite and the Sun; it is nece
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