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英语翻译1.If my sister is twice as old as my brother.2.My father

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英语翻译
1.If my sister is twice as old as my brother.
2.My father is 21 years older than I.In 12 years' time,his age will be twice mine.
3.In 4 years' time,Susie will be twice as old as she was 16 years ago.
4.When I am as old as my brother is now,my sister will be three years older than I will be then,and my brother will be 12 years older than my sister will be then.If our ages add up to 57 now,how old are we?
英语翻译1.If my sister is twice as old as my brother.2.My father
如果我的姐姐是我弟弟的两倍大.
我爸爸比我大21岁.在12年后,他会比我大一倍.
在4年后,Susie会比她16年以前大一倍.
当我像我哥哥现在这么大的时候,那时侯我姐姐会比我大3岁,我哥哥会比我姐姐大12岁.如果我们的年龄加到一起就是57岁,那么我们都是多大呢?