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They are generally built to facilitate transportation, but from the beginning they have been used for many additional purposes including draining swamps , irrigating land for cultivation , and promoting economic development .</p><p align="left">Canals are often classified by the size of vessel they can accommodate . Some small local canals . which are able to float only 100- to 300-ton boats or small rafts of timber , may be only 3 feet deep . Major barge canals generally range from 6 to 9 feet in depth , and some are as much as 10 or 12 feet deep . These canals can carry 1,350- to 2,000-ton craft . Ship canals are 25 feet or more deep and are capable of accommodating large vessels in the seagoing class.</p><p align="left">Canals may also be classified as either water-level or lock canals. Water-level canals do not vary in height along their courses . The best known of these is the Suez Canal , which is at sea level . Lock canals , which include most modem waterways , contain locks, or special devices for raising and lowering boats along their courses by changing the depth of the water . Each lock is a stretch of water enclosed by gates at each end . After a boat enters the lock, water is let or drained out until it reaches approximately the same level as the water ahead .</p><p align="left">重點單詞：</p><p align="left">canal : n. 運河,小道,管,溝渠;vt. 開運河</p><p align="left">watercourse : n. 水道,河道</p><p align="left">construct : vt. 構(gòu)造,建造,想出,作圖;n. 構(gòu)成物</p><p align="left">improve : vt. 改良,改善,利用;vi. 變得更好,增加</p><p align="left">extend : vt. vi. 擴(kuò)充,延伸,伸展,擴(kuò)大;v. 擴(kuò)展</p><p align="left">waterway : n. 航路,水路,運河</p><p align="left">facilitate : vt. 幫助,使容易,促進(jìn)</p><p align="left">transportation : n. 運輸,輸送,交通業(yè)</p><p align="left">additional : a. 附加的,另外的,額外的</p><p align="left">purpose : n. 目的,意向,決心,論題,效果,意義;vt. 意欲,企圖,計劃</p><p align="left">drain : n. 排水溝,消耗,排水;vt. 排出溝外,喝光,耗盡;vi. 排水,流干</p><p align="left">swamp : n. 沼澤,濕地;vt. 淹沒,擊潰,清除,使陷于沼澤;vi. 陷于沼澤,淹沒</p><p align="left">irrigate : vt. 灌溉,沖洗傷口,使潮濕;vi. 進(jìn)行灌溉</p><p align="left">cultivation : n. 教化,培養(yǎng),耕作</p><p align="left">promote : vt. 促進(jìn),升遷,創(chuàng)辦</p><p align="left">classified : a. 分類的,類別的,被指定為機(jī)密的</p><p align="left">vessel : n. 船,容器,脈管</p><p align="left">accommodate : vt. 使適應(yīng),調(diào)節(jié),和解,向...提供,容納,通融,調(diào)和;vi. 適應(yīng)</p><p align="left">local : a. 地方性的,當(dāng)?shù)氐?局部的,鄉(xiāng)土的,本地的;n. 當(dāng)?shù)鼐用?本地新聞,局部</p><p align="left">float : n. 漂流物,浮舟,漂浮,浮萍,彩車;vi. 浮動,飄動,散播,搖擺,浮動,動搖;vt. 使漂浮,容納,淹沒,發(fā)行,實行</p><p align="left">raft : n. 筏,救生艇,大量;vi. 乘筏;vt. 筏運,制成筏</p><p align="left">timber : n. 木材,木料;vt. 用木材建造</p><p align="left">barge : n. 駁船;vt. 用船運輸;vi. 蹣跚,闖入</p><p align="left">craft : n. 技藝,手藝,詭計;船舶 vt. 巧手制作</p><p align="left">capable : a. 有能力的,能的,能干的</p><p align="left">accommodating : a. 親切的,肯通融的,殷勤的</p><p align="left">seagoing : a. 適于遠(yuǎn)航的</p><p align="left">water-level : 水平面,水位;水準(zhǔn)儀</p><p align="left">lock : n. 鎖,剎車,水閘,一縷頭發(fā);vt. 鎖,鎖上,拘禁,使固定,卡住,隱藏;vi. 鎖住,緊閉,連接</p><p align="left">vary : vt. 改變,使多樣化;vi. 變化,不同,違反 alter : vt. vi. 改變</p><p align="left">height : n. 高度,海拔,高地,頂點</p><p align="left">modem : n. 調(diào)制解調(diào)器</p><p align="left">contain : vt. 包含,容納,容忍;vi. 自制</p><p align="left">device : n. 裝置,設(shè)計,策略,發(fā)明物,設(shè)備;n. DOS命令:安裝設(shè)備驅(qū)動程序</p><p align="left">stretch : n. 伸展,張開,連綿,一段路,一段時間;a. 可伸縮的,彈性的;vt. 伸展,張開,曲解,使過度伸展;vi. 伸展,延伸</p><p align="left">approximately : ad. 大約,大致,近乎</p><p align="left">ahead : a. ad. 領(lǐng)先,向前地,勝于,在前面</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. All rights reserved. </span><span class=itm>搜狐公司   版權(quán)所有</span></div><!-- #EndLibraryItem --> </center></body><!-- #EndTemplate --></html>