求精确翻译，

Van Gogh's art dealer uncle, Cornelis, commissioned 20 ink drawings of the city, the artist completed by the end of May. That June, he spent three weeks in a hospital suffering gonorrhea.
梵高的做艺术品交易的叔叔，Cornelis，为城市代理出售20副油画，画家于五月底完工。而当年六月，Corneli