60.在所有的经济作物中，棕榈树得到的研究最少。

60. Of all the economically important plants, palms have been the least studied.

59.谨慎的航海员在出航前，会研究航向，记录的灯塔的位置，以便对各种可能出现的情况做到有备无患。

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.

58.在竹子的近七百个品种中，有的全长成还不到一英尺，有的却能在二十四小时内长出三英尺。

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.

57.十八世纪时，"小乌龟"是迈阿密部落的酋长，该部落的地盘就是今天的印第安那州和俄亥俄州。

57. During the eighteenth century, Little Turtle was chief of the Miami tribe whose territory became what is now Indiana and Ohio.

56.相互般配的珍珠，串成一条项链，就能卖到比单独售出好得多的价钱。

56. Perfectly matched pearls, strung into a necklace, bring a far higher price than the same pearls told individually.