例句與造句

1. In physics, "'optical depth "'or "'optical thickness "', is the " natural logarithm " of the ratio of incident to " transmitted " radiant power through a material, and "'spectral optical depth "'or "'spectral optical thickness "'is the natural logarithm of the ratio of incident to " transmitted " dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero.
2. It's difficult to find spectral optical thickness in a sentence. 用spectral optical thickness造句挺難的