My little grandson is no trouble at all, but his 6-year-old sister is a handful.
我的小孙子一点不用人操心，但他6岁的姐姐却很难管教。
One famous experiment in the 1960s involved 3- to 6-year-old children.
20世纪60年代，在3到6岁的儿童中开展了一项著名实验。
My 6-year-old daughter and my husband were drawing on pieces of wood.
我6岁的女儿和我的丈夫在木板上画画。
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