Chinese meaning of "oxidizing agent"?

i am confused about the oxidizing agent & reducing agent. A sample of Zn corrodes in moist air. ask: what metal could be attached to the sample to prevent the corrosion of Zn? Explain. answer key: the metal is : Magnesium (Mg) The Mg is more easily oxidized than the Zn. I am confused the... 顯示更多 i am confused about the oxidizing agent & reducing agent.
A sample of Zn corrodes in moist air.
ask: what metal could be attached to the sample to prevent the corrosion of Zn? Explain.
answer key: the metal is : Magnesium (Mg)
The Mg is more easily oxidized than the Zn.

I am confused the answer, what is the meaning in Chinses for :"The Mg is more easily oxidized than the Zn." ? If Mg is easily being oxidized, why it can prevent the corrosion?
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