在50岁之前，他下苦功夫，临摹古代山水画大师的作品，打下了深厚的传统功力。

Before the age of 50, he had copied the works of many famous ancient Chinese landscape painters, which laid his solid traditional Chinese painting foundation.

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为了证明他的观点，他引证了16世纪荷兰大师的画作，其中暖色调的山水画，据他所称，表明当时的气温要比现在高。

As evidence, he cited the paintings of the 16th century Dutch masters, whose warmly colored landscapes, he said, showed that temperatures were indeed higher back then.

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