求翻译：体形通常中等大小，是寒温带针叶林和混交林中的典型代表动物。松鼠上颌臼齿为5枚，下颌4枚。前后肢间无皮翼。四肢强健，趾有锐爪，爪端呈钩状，体重通常在350克左右，雌性个体比雄性个体稍重一些。松鼠体态修长而轻盈，体长大约为18-26厘米，尾长而粗大，尾长为体长的三分之二以上，但不及体长是什么意思？

Usually medium-size body is cold temperate coniferous forests and mixed forests in the typical animal. Maxillary molars of five squirrels, jaw 4. Hind wing without a skin before. Strong limbs, toes have sharp claws, claws hooked end, weight is usually 350 grams, females slightly heavier than males.

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The squirrel is one kind of very lovable micro-organism, also clever also is docile, I introduce ~!

Shape usually is of medium size, in the boreal coniferous and mixed forests are typical of animals. Squirrel maxillary molars are 5, mandibular 4. No skin between the legs before and after wing. Robust limbs, toes have sharp claws and claw-end is hooked and gain weight at an altitude of 350 grams, f

Usually medium-size body is cold temperate coniferous forests and mixed forests in the typical animal. Maxillary molars of five squirrels, jaw 4. Hind wing without a skin before. Strong limbs, toes have sharp claws, claws hooked end, weight is usually 350 grams, females slightly heavier than males.