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1. The Tyndall cone is a type of optical instrumentused to measure the refractive indexof materials.
坦丁锥是一种用于测量材料折射率的光学仪器。
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2. This cylinder hasa conical shape, which is characteristicof many natural objects.
这个圆柱体具有锥形形状，这是许多自然物体的共同特征。
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3. The spherical surface of theTyndall cone reflects light in alldirections, making it useful for illuminating dark areas.
坦丁锥的球面表面向各个方向反射光线，这使得它对于照亮黑暗区域非常有用。