翻译：我最近还在另一个地方说过：艺术的最高境界是无技巧。

地下水主要存在于岩石的孔隙之中。

黄土主要的工程地质特性是湿陷性。

翻译：Driving southward from Cairo into the valley, I entered a landscape that owed little to the present era.

设，(z) 在 X。可导，则

物理风化是化学风化的前提和必要条件，化学风化是物理风化的继续和深入;所以一般来说先进行物理风化，再进行化学风化。

翻译：It is no use telling grown-up children not to make mistakes, both because they will not believe you, and because mistakes are an essential part of education.

土的压缩是指什么？

翻译：Byron ’ s father, by his first marriage, had a daughter, Augusta, Byron -sister. ’ s half