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20120718 <第四期4-17科技> Why Is Earth So Dry? Planet Formed from Rocky Debris in Hotter Region, Inside of Solar System's 'Snow Line'
swath[sw?θ] n. 细长的列 behemoth [b?'hi?m?θ; 'bi?h?,m??θ] adj. 巨大的;高大的 glacier['glæs??; 'gle?s??] n. 冰河,冰川 With large swaths of oceans, rivers that snake for hundreds of miles, and behemoth glaciers near the north and south poles, Earth doesn't seem to have a water shortage.
lock up把…锁起来;关起来 comet ['k?m?t] n. [天] 彗星 asteroid ['æst?r??d] n. [天] 小行星 And yet, less than one percent of our planet's mass is locked up in water, and even that may have been delivered by comets and asteroids after Earth's initial formation.
deficiency [d?'f??(?)ns?] n. 缺陷,缺点;缺乏 Astronomers have been puzzled by Earth's water deficiency.
protoplanetary disk 原行星盘 swirling [sw?:li?] n. 漩涡;涡流adj. 打旋的 The standard model explaining how the solar system formed from a protoplanetary disk, a swirling disk of gas and dust surrounding our Sun, billions of years ago suggests that our planet should be a water world.
condense [k?n'dens] vi. 浓缩;凝结 Earth should have formed from icy material in a zone around the Sun where temperatures were cold enough for ices to condense out of the disk.
debris ['debri?; 'de?bri?] n. 碎片,残骸 A new analysis of the common accretion-disk model explaining how planets form in a debris disk around our Sun uncovered a possible reason for Earth's comparative dryness.
innermost ['?n?m??st] adj. 内心的;最里面的,最深处的;秘密的 In fact, our model predicts that the other innermost planets, Mercury, Venus, and Mars, are also relatively dry. "
Ionized ['ai?,naiz] adj. [化学][物] 电离的;已电离的 funnel ['f?n(?)l] n. 漏斗;烟囱 In the conventional model, the protoplanetary disk around our Sun is fully ionized (a process where electrons are stripped off of atoms) and is funneling material onto our star, which heats up the disk.
infall['?nf??l] vi. 陨落 But young stars don't have enough radiation or enough infalling material to provide the necessary energetic punch to ionize the disks."
astronomical [æstr?'n?m?k(?)l] adj. 天文的,天文学的;极大的 The dead zone typically extends from about 0.1 astronomical unit to a few astronomical units beyond the star. (An astronomical unit is the distance between Earth and the Sun, which is roughly 93 million miles.)
dense [dens] adj. 稠密的;浓厚的;愚钝的 gravitational [,ɡræv?'te??nl] adj. [力] 重力的,[力] 引力的 compression [k?m'pre?(?)n] n. 压缩 The dense matter begins to heat up by gravitational compression.
vaporize ['ve?p?ra?z] v. 蒸发 This process, in turn, heats the area outside the plug, vaporizing the icy material and turning it into dry matter.
sophisticated [s?'f?st?ke?t?d] adj. 复杂的 The ability of infants to recognize speech is more sophisticated than previously known, researchers in New York University's Department of Psychology have found.
perception [p?'sep?(?)n] n. 知觉;[生理] 感觉 resilient [r?'z?l??nt] adj. 弹回的,有弹力的 refined [r?'fa?nd] a. 精确的 "Our results show that infant speech perception is resilient and flexible," explained Athena Vouloumanos, an assistant professor at NYU and the study's lead author. "This means that our recognition of speech is more refined at an earlier age than we'd thought."
ambiguous [æm'b?ɡju?s] adj. 模糊不清的;引起歧义的 It is well-known that adults' speech perception is fine-tuned -- they can detect speech among a range of ambiguous sounds.
gauge [ge?d?] vt. 测量;估计 aptitude ['æpt?tju?d] n. 天资 perceive [p?'si?v] v. 察觉,感觉;理解;认知 In order to gauge the aptitude to perceive speech at any early age, the researchers examined the responses of infants, approximately nine months in age, to recorded human and parrot speech and non-speech sounds.
checkerboard ['t?ek?b??d] n. 棋盘;西洋跳棋棋盘 In this study, sounds were paired with a series of visuals: a checkerboard-like image, adult female faces, and a cup.
nuanced ['nju:ɑ:nst, nju:'ɑ:nst] adj. 微妙的;具有细微差别的 Their findings on non-human speech were more nuanced. |
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