潛在危險天體
A huge asteroid known as 231927 is going to sweep by the Earth on March 21 and will come within two million kilometers from the Earth at its closest approach, according to NASA.
根據美國國家航空暨太空總署指出，編號231937的巨大小行星將於3月21日飛越地球，最近離地球約兩百萬公里以內。
huge(adj.)巨大的;龐大的be known as=被稱作...close-closer-closestapproach(v.)(n.)接近;靠近The train is approaching the platform.
The space rock is estimated 0.8 to 1.7 kilometers in diameter, more than twice the size of the tallest building on earth, the Burj Khalifa.
該行星的直徑估計介於0.8至1.7公里，比全球最高建築哈里發塔高出兩倍之多。
estimate(v.)估計;估算diameter(n.)直徑The cylinder is 5 centimeters in diameter.radius(n.)半徑
It is traveling at about 120,000 kilometers per hour, becoming the fastest object that whizzes by our planet.
其時速高達每小時12萬公里，是飛越地球最快的天體。
travel(v.)旅行;運行whiz(v.)快速移動
In fact, 231927 has been under observation since it was discovered in 2001 by an array of telescopes in New Mexico which are part of the Lincoln Near-Earth Asteroid Research program.
事實上，林肯近地小行星研究計畫早在2001年就已透過新墨西哥州的望遠鏡觀測到編號231937小行星，並持續觀測至今。
observation(n.)觀察;觀測The patient has been sent to the hospital for observation.discover(v.)發現an array of sth.=一批;大量地;一系列的An array of merchandise has been displayed in the store.telescope(n.)天文望遠鏡binoculars(n.)雙筒望遠鏡Astronomers observe stars with a telescope.
NASA defines any near-Earth objects that come within 7.4 million kilometers of the Earth and measure over 140 meters across as potentially hazardous objects.
NASA認定與地球距離小於740萬公里，且直徑大於140公尺的近地天體為有潛在危險的天體。
define A as B=把A定義為BTaking stuff without the owner’s permission is defined as stealing.near-Earth object=近地天體measure(v.)測量;尺寸為...potentially(adv.)潛在地hazardous(adj.)危險的
While 231927 is said to be potentially hazardous, it is unlikely that the asteroid will hit the Earth since it is five times further away than the moon.
雖說編號231937小行星帶有潛在危險，但該行星不大可能撞擊地球，因為相較於月球，該行星離我們有五倍之遠。
it is unlikely that...=不大可能...likely(adj.)有可能的hit(v.)衝擊;撞擊further(adj.)更遠的