They range from 2 25 mm long and are usually yellow, brown, red, or black.
他们从2月25日毫米长，通常是黄色，棕色，红色或黑色。
Natural resins are usually transparent or translucent yellow to brown and can melt and burn.
树脂通常是透明的，或者是半透明的黄色到棕色物，能够熔化和燃烧。
Natural resins are usually transparent or translucent yellow to brown and can melt and burn.
树脂通常是透明的，或者是半透明的黄色到棕色物，能够熔化和燃烧。
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