名词 gas:

1. the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container

2. a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely

3. a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines

4. a state of excessive gas in the alimentary canal

5. a pedal that controls the throttle valve

6. a fossil fuel in the gaseous state; used for cooking and heating homes

动词 gas:

1. attack with gas; subject to gas fumes

2. show off

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1. The air is infected with noisome gases.
   空气受到了有害气体的污染。
2. Helium and neon are inert gases.
   氦和氖为惰性气体。