加上3是4，六分之四，还剩六分之二，也就是三分之一。

So, one plus three is four, four sixths, which leaves two sixths, or one third.

youdao

加上3是4，六分之四，还剩六分之二，也就是三分之一。

So, one plus three is four, four sixths, which leaves two sixths, or one third.

youdao