How to instill vitality in the teaching of gouache painting from nature is a question teachers should consider.

如何在水粉静物教学中注入新的活力，是教师应该经常考虑的问题。

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That is to say, the onsite painting from life or nature provides a reference or stimulus to him.

也就是说，所谓现场的写生，对他而言也只是提供了一个参照物和刺激而已。

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Up to now he has persisted in painting from life and sketching from nature.

至今他还坚持面对自然和人物写生。

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Another more prosaic reason for the repetitive nature of Munch's painting was that he hated being parted from his work.

WSJ: A Thoroughly Modern Munch | 'Edvard Munch: L'Oeil Moderne' at the Pompidou Center in Paris