一个哥哥，一个妹妹，一个姐姐。

An elder brother, a younger sister, an elder sister.

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我有一个姐姐、一个妹妹、一个弟弟。

I have one older sister, one younger sister and one younger brother.

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一个4岁的孩子可能会抗议说，姐姐或妹妹喝的果汁更多。但其实果汁的量一样，只是杯子的形状不同。

A 4-year-old may protest that a sister has more fruit juice when it is only the shape of the glasses that differ, not the amount of juice.

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