单词:cement-sand-molasses process
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Lesson 47 Television Day: The sea TV Commentary: If you looked at the Pacific from a space-capsule you might think that the world was all water. You would hardly be able to see any land at all. Water covers most of the earth's surface. The sea contai
By Naomi Schwarz Dakar 21 December 2007 Rebels and government troops in Ivory Coast are set to begin the long-awaited disarmament process on Saturday, a critical first step before forming a new national army is the divided country. Ivory Coast Presid
今天我们要讲两个表示速度很慢的常用语。第一个是:Slow burn. Slow可能大家都已经知道,是慢的意思,burn这个字有不少解释。最基本的一个意思是:烧,
This is the VOA Special English Agriculture Report. Rice hulls, or husks, are the protective coverings on grains of rice. Rice with just its hull removed is brown rice. Rice without its hull or bran is white rice. Once rice is harvested, the hulls ar
There are more than 26 thousands casting companies in China, accounting for half of all the global manufacturers of casting products. But the traditional method of handmaking castings is heavily reliant on human resources and energy, and can produce
Cement is a major component of concrete, the world's most widely used man-made material, an integral part of roads, bridges and buildings. But making cement requires heating limestone and other materials to very high temperatures, a process that rele