然而，在苛刻光照条件下，这种近似的误差往往比较大，以至于很难恢复出反射率信息。
However, the approximation error can be large under harsh lighting conditions, thus making it difficult to recover albedo information.
在适当的条件下，较简捷地得出了这两类非线性波方程的近似解。
Under appropriate conditions, the approximate solutions for two nonlinear wave equations are obtained simply and conveniently.
同时，还推得在一定条件下，这种分布是近似于巴氏分布。
Meanwhile, the distribution drived under certain condition is approximate to that of PASCAL.
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