A trace of the vein is clearly visible, covered with "leaf", as the withered old lady's hand.

一丝丝的脉络清晰可见，上面覆盖着“叶肉”，像老太太枯槁的手。

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The respective trace of rock bed, vein must be utilized usually in the study on a fault except the complicated fault, such as deep and big fault.

除了深、大断裂等复杂断层以外，研究一般断层都需利用岩层、岩脉等各自的迹线。迹线的产状实质上是空间二斜面相交线的产状，属于立体几何学等数学范畴。

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