翻译下列句子。
①这是我的橡皮。
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②那是你的铅笔吗?
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③这是他的铅笔盒吗?
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④是的,它是我的钢笔。
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①This is my eraser.
②Is that your pencil?
③Is this his pencil case?
④Yes, it's my pen.