1. occurs in natural gas; used in the manufacture of rubber and fuels. 
   见于天燃气中，用于制造橡胶和燃料。
2. a lightweight material in cellular form; made by introducing gas bubbles during manufacture. 
   一种轻质的多孔材料，制造过程中加入了气泡。
3. This ordinance and its subsidiary regulations cover all aspects of fuel gas importation, manufacture, storage, transport, supply and use of gas. 
   该条例和附属规例就气体燃料的进口、生产、储存、运输、供应及使用等事宜，作出周详的安全规定。
4. A colorless, pungent gas, NH3, extensively used to manufacture fertilizers and a wide variety of nitrogen-containing organic and inorganic chemicals. 
   氨，阿摩尼亚一种无色刺激性气体，nh3，大量用于制造化肥和多种含氮有机或无机化合物
5. A toxic flammable gas, CH3NH2, produced by the decomposition of organic matter and synthesized for use as a solvent and in the manufacture of many products, such as dyes and insecticides. 
   甲胺一种有毒易燃气体，ch3nh2，通过分解有机物来制造，合成后用做溶剂，也用在许多产品中，诸如颜料与杀虫剂的制造中

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