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The Doppler effect is sensitive only to motion along the line of sight.
Quota System
A method for controlling immigration or trade by allocating specific limits to certain groups or countries.
Immigrants
People who move to a country other than their native one to live, often in search of better living conditions, employment, or to escape conflict.
Freedom
The power or right to act, speak, or think as one wants without hindrance or restraint.
Affluence
The state of having a great deal of wealth or material goods; wealthiness.
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