51. Using many symbols makes it possible to put a large amount of information on a single map. 使用多種多樣的符號(hào)可以在一張地圖里放進(jìn)大量的信息。

　　52. Anarchism is a term describing a cluster of doctrines and attitudes whose principal uniting feature is the belief that government is both harmful and unnecessary. 無(wú)政府主義這個(gè)詞描述的是一堆理論和態(tài)度，它們的主要共同點(diǎn)在于相信政府是有害的，沒(méi)有必要的。

　　53. Probably no man had more effect on the daily lives of most people in the Untied States than did Henry Ford a pioneer in automobile production. 恐怕沒(méi)有誰(shuí)對(duì)大多數(shù)美國(guó)人的日常生活影響能超過(guò)汽車(chē)生產(chǎn)的先驅(qū)亨利·福特。

　　54. The use of well-chosen nonsense words makes possible the testing of many basic hypotheses in the field of language learning. 使用精心挑選的無(wú)意義詞匯，可以檢驗(yàn)語(yǔ)言學(xué)科里許多基本的假定。

　　55. The history of painting is a fascinating chain of events that probably began with the very first pictures ever made. 優(yōu)化歷史是由一連串的迷人事件組成，其源頭大概可以上溯到最早的圖畫(huà)。

　　56. Perfectly matched pearls，strung into a necklace，bring a far higher price than the same pearls told individually. 相互般配的珍珠，串成一條項(xiàng)鏈，就能賣(mài)到比單獨(dú)售出好得多的價(jià)錢(qián)。

　　57. During the eighteenth century，Little Turtle was chief of the Miami tribe whose territory became what is now Indiana and Ohio. 十八世紀(jì)時(shí)，“小烏龜”是邁阿密部落的酋長(zhǎng)，該部落的地盤(pán)就是今天的印第安那州和俄亥俄州。

　　58. Among almost seven hundred species of bamboo，some are fully grown at less than a foot high，while others can grow three feet in twenty-four hours. 在竹子的近七百個(gè)品種中，有的全長(zhǎng)成還不到一英尺，有的卻能在二十四小時(shí)內(nèi)長(zhǎng)出三英尺。

　　59. Before staring on a sea voyage，prudent navigators learn the sea charts，study the sailing directions，and memorize lighthouse locations to prepare themselves for any conditions they might encounter. 謹(jǐn)慎的航海員在出航前，會(huì)研究航向，記錄的燈塔的位置，以便對(duì)各種可能出現(xiàn)的情況做到有備無(wú)患。

　　60. Of all the economically important plants，palms have been the least studied. 在所有的經(jīng)濟(jì)作物中，棕櫚樹(shù)得到的研究最少。

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