C2H4, derived from natural gas and petroleum and used as a source of many organic compounds, in welding and cutting metals, to color citrus fruits, and as an anesthetic.
乙烯一种无色易燃气体，C2H4，可从天然气和石油中获得，用作许多有机化合物的来源，用于焊接和切割金属，柑桔属水果的着色，以及用作麻醉剂。
Acetylene (ethyne) Simplest alkyne, C2H2. A colourless, flammable, explosive gas, it is used as a fuel in welding and cutting metals and as a raw material for many organic compounds and plastics.
乙炔：最简单的炔(C2H2)，无色可燃气体，广泛用作金属焰焊接和切割的燃料，也是合成许多有机化学品和塑料的原料。
Hardness value of welding area is higher than that of 316l and aluminum. It indicates that there are the compounds on the interface.
焊缝区的硬度值较基体316 L板及铝板各自的硬度值高，表明界面有化合物存在。
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