4網(wǎng)絡(luò)漫游 南極洲 (doc)
4. Exploring the Internet:Antaretica Antarctica1 is the highest, driest and coldest continent. 　　Its 5.4 million square miles make it larger than Europe. At its widest point, Antarctica is about 4,000 miles across. There are about 98％ thick continental ice sheet and 2％ barren2 rock. The average thickness of the ice sheet is 7,200 feet; this amounts to 90％ of all the ice and 70％ of all the fresh water in the world. If the ice cap were to melt, the sea level would rise by an average of 230 feet. Mountain ranges up to 4897 meters high. Glaciers3 form ice shelves4 along about half of the coastline, and floating ice shelves constitute 11％ of the area of the continent. 　　Severe low temperatures vary with latitude5, elevation6, and distance from the ocean; East Antarctica is colder than West Antarctica because of its higher elevation. Antarctic Peninsula7 has the most moderate climate. Higher temperatures occur in January along the coast and average slightly below freezing. Average temperatures are never above 32 degrees Fahrenheit8, even in summer. In winter, the temperature averages minus 76 degrees. 　　The Pole is actually a desert environment, averaging about the same amount of monthly rainfall as the Sahara Desert9. 　　In October 1991 it was reported that the ozone shield, which protects the Earth’s surface from harmful ultraviolet10 radiation, had dwindled11 to the lowest level recorded over Antarctica since 1975 when measurements were first taken. 網(wǎng)絡(luò)漫游：南極洲 南極洲是最高、最干且最冷的大陸。 540萬(wàn)平方英里的面積使其比歐洲還要大。其最寬闊處約4000英里。南極約98％覆蓋 著厚厚的大陸冰床，2％為光禿的巖石。冰床平均厚度是7200英尺，占地球總冰量90％、 淡水70％。若冰層融化，地球的海平面將平均上升230英尺。南極山脈最高達(dá)4897米。約 半數(shù)的海岸沿線都有冰川形成的冰塊，其中浮冰塊占整個(gè)大陸面積的11％。 　　嚴(yán)寒低溫隨緯度、海拔和距海洋遠(yuǎn)近的不同而不同。南極洲東部由于海拔較高，比 南極洲西部寒冷。南極洲半島氣候最溫和。1月份沿海地帶的溫度較高，溫度稍低于零度 。即使在夏季，平均氣溫也不會(huì)超過(guò)32華氏度。在冬天，平均氣溫為零下76度。 　　極地實(shí)際上是一個(gè)沙漠環(huán)境，平均月降雨量約相當(dāng)于撒哈拉沙漠。 　　據(jù)報(bào)道，1991年10月，南極上空防止地球表面遭受有害紫外線輻射的臭氧層，萎縮 至1975年開(kāi)始有測(cè)量記錄以來(lái)的最低點(diǎn)。 1.Antarctica[“ντ5Β:κτικΕ]南極洲 2.barren[5β“ρΕν]adj.不毛的，荒蕪的 3.glacier[5⊥λ“σφΕ]n.冰川，冰河 4.iceshelves[Φελπζ](極地海岸周?chē)?冰架 5.latitude[5λ“τιτφυ:δ]n.緯度 6.elevation[7ελι5πειΦΕν]n.高度，海拔 7.peninsula[πι5νινσφυλΕ]n.[地]半島 8.Fahrenheit[5φ“ρΕνηαιτ]adj.華氏溫度計(jì)的，華氏的 9.Sahara[σΕ5ηΒ:ρΕ]Desert撒哈拉沙漠 10.ultraviolet[5ΘλτρΕ5παιΕλιτ]adj.紫外線的 11.dwindle[5δωινδλ]vi.變小，減少
4網(wǎng)絡(luò)漫游 南極洲 (doc)