It is known that the lengths of the two sides of the triangle are 2 cm and 9 cm respectively, and the perimeter of the triangle is an odd number, then what is the length of the third side in cm
已知三角形两条边的长分别为2厘米和9厘米，又知该三角形的周长是奇数，那么第三边的长是多少厘米
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