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Mars
火星
Mars is a planet.
火星是行星。
It is next to the Earth.
它緊鄰地球。
Its size is about one fourth of the Earth.
它約有四分之一個地球大。
Mars is not far from the Earth, but the environment is very different.
火星離地球很近，但環境卻大不相同。
Beacuse Mars is far from the sun.
因為火星離太陽很遠。
Mars's average temperature is lower than the Earth.
火星的平均溫度比地球要低。
Mars does not have water.
火星上沒有水。
There is no oxygen.
那里也沒有氧氣。
Therefore, there are no living things on Mars at all.
因此，火星上根本就沒有生物。
