求翻译：在达·芬奇的艺术遗产中，大量的素描习作也颇值得重视，这些素描和他的正式作品一样，同样达到了极高的水平，被誉为素描艺术的典范。其特点是：观察入微，线条刚柔相济，尤善于利用疏密程度不同的斜线，表现光影的微妙变化。他的每一件作品都以素描作基础。是什么意思？

Leonardo da Vinci's artistic heritage, a lot of sketches assignments quite noteworthy, these sketches and his official work, and achieve the same high level, hailed as a model sketch art. Its characteristics are: observant lines hardness and softness, especially good use of different density, slash,

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In reaches · in the fragrance wonderful art inheritance, the massive sketch exercise quite is also worth taking, these sketches and his official work are same, similarly has achieved the extremely high level, by reputation for sketch art model.Its characteristic is: Observes into micro, the line tam

In Leonardo's artistic heritage, a large number of sketches of compositions is also very worthy of attention, like those sketches and his formal works, also reached extremely high levels, known as sketch model for art. Its characteristics are: observation, lines and softness, especially adept at usi

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