By the mid-nineteenth century,the term icebox had entered the American language,but ice was still only beginning to affect the diet of ordinary citizens in the United States.The ice trade grew with the growth of cities.Ice was used in hotels, taverns, and hospitals,and by some forward-looking city dealers in fresh meat,fresh fish, and butter.

      Nevertheless,early efforts to economize ice included wrapping up the ice in blankets,which kept the ice from doing its job.Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation and circulation needed for an efficient icebox.But as early as 1803, an ingenious Maryland farmer,Thomas Moore, had been on the right track. When he used an icebox of his own design to transport his butter to market,his butter, still fresh and hard in neat,was worth one-pound a brick.One advantage of his icebox, Moore explained,was that farmers would no longer have to travel to market at night in order to keep their produce cool.

      本文由培訓無憂網新東方教育專屬課程顧問整理發布，更多大學英語四六級考試培訓課程信息歡迎關注培訓無憂網英語四六級培訓頻道或添加老師微信：15033336050

      注：尊重原創文章,轉載請注明出處和鏈接 http://www.hebeijilong.cn/news-id-6970.html 違者必究！部分文章來源于網絡由培訓無憂網編輯部人員整理發布,內容真實性請自行核實或聯系我們，了解更多相關資訊請關注英語四六級頻道查看更多，了解相關專業課程信息您可在線咨詢也可免費申請試課。關注官方微信了解更多：150 3333 6050