求翻译：有个年轻人向理发师学习剪头发，师傅要求学生先拿冬瓜经行练习，用剃刀把冬瓜上的一层薄薄的毛剃干净但不能损坏冬瓜皮。是什么意思？

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A young man learning to barbers reduced haircuts by requiring students to master the exercises, the first winter melon with razors in the melon, a thin layer of kezori melon skin clean but not damaged.

Has young people to study to the barber cuts the hair, skilled worker requests the student to take the winter melon silk thread business to practice first, but shaves cleanly with shaving cutter winter melon on light wool cannot damage the winter melon skin.

A young person to learn from the Barber haircut, teacher asked the students to take white gourd through practice, with a razor on a thin layer of wax gourd of shaving clean but not damaged winter Melon rind.

Have pieces of young people learn from hairdresser cut hair, master worker require student take wax gourd pass competent exercise first, shave a layer of thin hair on the wax gourd clean but can't damage the peel of the wax gourd with the razor.