6. Trade was the mainstay of the urban economy in the Middle East, as caravans negotiated the surrounding desert, restricted only by access to water and by mountain ranges.
因为商队只能通过水路和山脉进入沙漠，贸易就成为了中东城市的主要经济支柱。
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7. The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life.
美国西部干燥的山脉包含了距今4.4亿至5.1亿年前的奥陶纪岩石，其中充斥着热带海洋生物生存的迹象。
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8. The class caters for all ability ranges.
这个班对各种不同水平的人都适合。
《牛津词典》
9. Virtually all cooking was done over coal-fired ranges.
事实上所有的烹饪都是在烧煤的炉灶上完成的。
《柯林斯英汉双解大词典》
10. Accommodation ranges from tourist class to luxury hotels.
住宿条件从经济旅馆至豪华宾馆不等。
《牛津词典》
11. The smaller lake ranges from five to fourteen feet in depth.
这个较小的湖的深度在5至14英尺之间。
《柯林斯英汉双解大词典》
12. Companies are cutting investment and pruning their product ranges.
公司都在削减投资并减少产品种类。
《柯林斯英汉双解大词典》
13. He ranges far and wide in search of inspiration for his paintings.
他四处漫步，寻找绘画的灵感。
《牛津词典》
14. The cost of starting up a day-care centre for children ranges from $150,000 to $300,000.
开办一家儿童日托中心的费用在15到30万美元之间不等。
《柯林斯英汉双解大词典》
15. Labor education, also called education on the hardworking spirit, ranges from housework to school labor and community voluntary services.
劳动教育，又称勤劳精神教育，包括家务劳动、学校劳动、社区志愿服务等。
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16. The poet, he says, ranges freely within the zodiac of his own wit.
他说，诗人在他智慧的黄道十二宫中自由地漫游。
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17. Competing species also tend to change their ranges so that their territories no longer overlap.
竞争物种也倾向于改变活动范围以使它们的领地不再重合。
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18. So voluminous is this collection, which ranges from paintings and scrolls to ancient porcelain and statues.
这批藏品浩如烟海，从绘画和卷轴到古代瓷器和雕像都有。
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19. It ranges from sea level in the Polar Regions to 4,500 meters in the dry subtropics and 3,500-4,500 meters in the moist tropics.
