New words：

contribute [kənˈtrɪbjuːt] v.捐助；捐献；贡献

Sample Sentences：

They contributed food and clothing for the refugees.
How much does Antarctica contribute to sea level rise?
I believe that each of us can contribute to the future of the world

refugee [ˌrefjʊˈdʒi] n.难民；避难者；逃亡者

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