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Those that did have flourished. Within about 50 million years -no time at all, geologically speaking -one of the four kinds of mammals that has returned to a marine environment has developed into the largest of all animal forms , the whale. A second kind, the seal , has produced what is probably the greatest population of large carnivorous mammals on Earth. This suggests that these "top dogs " of the ocean are prospering and multiplying . However , such has not been the case, at least not for the last 150 years. Trouble has closed in on these mammals in the form of equally warm-blooded and even more efficient and adaptable predators, human. At sea, as on land, humans have now positioned themselves on top of the whole great pyramid of life, and they have caused serious problems for the mammals of the sea.</p><p align="left">There is a simple reason for this. Marine mammals have the misfortune to be swimming aggregates of commodities that humans want: fur, oil, and meat. Even so, they might not be so vulnerable to human depredation if they did not , like humans, reproduce so slowly. Every year humans take more than 50 million tons of fish from the oceans without critically depleting the population of any species. But the slow-breeding mammals of the sea have been all but wiped out by humans seeking to satisfy their wants and whims.</p><p align="left">重點單詞：</p><p align="left">abundance : n. 豐富,充足,大量</p><p align="left">understandable : a. 可以理解的</p><p align="left">efficient : a. 有效率的,能干的</p><p align="left">adaptable : a. 能適應的,可修改的</p><p align="left">mammal : n. 哺乳動物</p><p align="left">evolve : vi. 進展,進化,展開;vt. 使發展,推論,使進化</p><p align="left">flourish : vi. 繁榮,茂盛,活躍,手舞足蹈;vt. 揮舞,夸耀;n. 茂盛,興旺,華飾</p><p align="left">geological : a. 地質學的,地質的</p><p align="left">marine : n. 艦隊,水兵,海運業;a. 海的,海產的,海底的,船舶的,海運的</p><p align="left">environment : n. 環境,外界,圍繞</p><p align="left">seal : n. 印章,封條,海豹,標志,火漆,焊接,保證,璽,封蠟,圖章,象征,批準;vt. 封閉,蓋印,蓋章;vi. 獵海豹</p><p align="left">carnivorous : a. 食肉的</p><p align="left">suggest : vt. 提議,建議,促成,啟發,暗示,使人想起</p><p align="left">prosper : vi. 繁榮,興隆,成功;vt. 使成功,使昌盛</p><p align="left">multiply : vt. vi. 繁殖,乘,增加</p><p align="left">trouble : n. 煩惱,麻煩,困難,辛苦,動亂,故障;vt. 困擾,麻煩,使煩惱,折磨;vi. 煩惱,費心</p><p align="left">equally : ad. 相等地,同樣地,平等地</p><p align="left">predator : n. 掠奪者,食肉動物</p><p align="left">position : n. 位置,地位,身份,姿勢,職位,狀態,立場,形勢,陣地;vt. 安置,決定...的位置</p><p align="left">pyramid : n. 角錐,金字塔;vt. vi. (使)成金字塔狀,(使)漸增,(使)上漲</p><p align="left">serious : a. 嚴肅的,認真的,重要的,嚴重的</p><p align="left">misfortune : n. 不幸,災禍,壞運氣</p><p align="left">aggregate : n. 合計,總計,集合體;a. 合計的,集合的,聚合的;vt. vi. 聚集,集合,合計</p><p align="left">commodity : n. 日用品,商品,有用的物品</p><p align="left">fur : n. 毛皮制品,毛皮,軟毛;vt. 以毛皮制作,使生苔,使生垢;vi. 生苔,積鍋垢</p><p align="left">vulnerable : a. 易受傷害的,有弱點的,易受攻擊的,脆弱的,成局的</p><p align="left">depredation : n. 掠奪,破壞痕跡</p><p align="left">reproduce : vt. vi. 繁殖,再生,復制,生殖</p><p align="left">critically : ad. 批評性地,用鉆研眼光地,精密地</p><p align="left">deplete : vt. 耗盡,使衰竭</p><p align="left">breeding : n. 教養,生育,飼養</p><p align="left">all but : 幾乎, 差不多</p><p align="left">wipe : n. 擦拭,用力打;vt. 擦,揩,消除,涂上,拭去;vi. 打 wipe out : 消滅</p><p align="left">seek : vt. 尋求,尋找,探索,請求,追求,搜索;vi. 尋找,搜索</p><p align="left">satisfy : vt. 使滿意,滿足,符合,說服,賠償;vi. 令人滿意,替人贖罪</p><p align="left">whim : n. 一時的興致,幻想,反復無常,怪念頭</p><p align="left"><a href="http://www.eol.com.cn/" target="_blank"><font color="#3399FF">以上由教育熱線提供</font></a></p><title></title><!-- #EndEditable --></p>              </td></tr></table>  <!-- End of search box and directories (columns 2 and 3: middle columns, combined into one) -->   <!-- #BeginLibraryItem "/Library/footer.lbi" --><hr noshade size=1 width=700><div align="center"><span class=eng><br>  Copyright &copy; 2001 Sohu.com Inc. 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