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But, Peters and Schmidt say, Gobekli Tepe's builders were on the verge of a major change in how they lived, thanks to an environment that held the raw materials for farming.
但是,皮特斯和斯密特说,因为大自然为务农和农业提供了原材料,歌贝克力山丘遗址的建造者正面临着生活方式的巨变。
A halogen element, f, is major raw materials deriving fluorine compound, and because of low melting point, that is widely used in steelmaking, nonferrous metal smelting, cement, glass and ceramics.
萤石中含有卤族元素氟,是制取含氟化合物的主要原料,又由于熔点低而广泛用于炼钢、有色金属冶炼、水泥、玻璃、陶瓷。
The synthesis of ethyl vanillin from urotropin is a major method with high yields, simple process, and available raw materials.
乌洛托品法是合成已基香兰素的一种重要方法,它操作简单,原料易得,产率较高。
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