求翻译：白狐体长50～75厘米，较一般狐小，尾长25～30厘米。自春末至夏季，体毛由白色逐渐变成青灰色，故常被称为“青狐”。是什么意思？

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white Fox 50 ~ 75 cm long, instead of the usual small, Fox 25 ~ 30 cm long tail. Since at the end of spring and summer from white hair on the body, gradually turned into the blue gray, is often called the "blue fox".

The arctic fox body length 50~75 centimeters, the common fox is small, tail length 25~30 centimeters.From the end of the spring to the summer, the body wool turns the bluish gray color gradually by the white, the same as ever is called “the blue fox”.

White Fox body length 50~75 cm, instead of the usual Fox small, tail length 25~30 cm. From late spring to summer, from white becoming green gray body hair, it is often called the "blue Fox".

The arctic fox has 50-75 centimetres long body, smaller than the general fox, have 25-30 centimetres longer tail. From will it be the end spring to summer, body mao by getting pale to turn into blue and green grey gradually, so often known as " blue and green fox ".