甲烷是一种无色，无味，易燃物质，是天然气的重要组成部分。
Methane is a colorless, odorless and flammable substance which forms a major component in natural gas.
一种无色、无味、毒性大的气体，CO，由于碳或含碳物质如汽油的不完全燃烧而形成。
A colorless, odorless, highly poisonous gas, co, formed by the incomplete combustion of carbon or a carbonaceous material, such as gasoline.
硼砂也叫粗硼砂，是一种既软又轻的无色结晶物质。
Borax also called coarse borax, is a kind of both soft and light colorless crystalline substance.
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