文章列表

• 1.双语有声阅读：博物馆
• 博物馆 从波士顿到洛杉机，从纽约到芝加哥、到达拉斯，所有的博物馆或者正在筹划、建造或者正在完成大规模的扩建计划。 这些计划或者已经根本性地改变了博物馆门...
• 2.双语有声阅读：镍钛合金
• Nitinol Nitinol is one of the most extraordinary metals to be discovered this century: A simple alloy of nickel and titanium, nitinol has some perplex...
• 3.双语有声阅读：油和水
• Oil and Water To understand the emulsifying process, we must first accept the scientific principle that oil and water do not naturally mix. Quite lite...
• 4.双语有声阅读：炼油
• Oil Refining An important new industry, oil refining, grew after the Civil War. Crude oil, or petroleum -- a dark, thick ooze from the earth -- had be...
• 5.双语有声阅读：钢琴
• Piano The ancestry of the piano can be traced to the early keyboard instruments of the fifteenth and sixteenth centuries -- the spinet, the dulcimer, ...
• 6.双语有声阅读：浮游生物
• Plankton Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals ar...
• 7.双语有声阅读：沙漠中的植物
• Plants in the Deserts Some cacti, like the saguaro, grow to tree size, but true trees need more moisture than most desert environments can supply, so ...
• 8.双语有声阅读：板块结构与海床扩展
• Plate Tectonics and Sea-floor Spreading The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of...
• 9.双语有声阅读：警察与社区
• Police and Communities Few institutions are more important to an urban community than its police, yet there are few subjects historians know so little...
• 10.双语有声阅读：人口增长
• Population Growth The growth of population during the past few centuries is no proof that population will continue to grow straight upward toward infi...