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So, one plus three is four, four sixths, which leaves two sixths, or one third.
加上3是4，六分之四，还剩六分之二，也就是三分之一。
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So, one plus three is four, four sixths, which leaves two sixths, or one third.
加上3是4，六分之四，还剩六分之二，也就是三分之一。
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