1. John is a renowned plantsman and has a vast knowledge of various plant species.

约翰是一位著名的植物专家，对各种植物物种拥有广泛的知识。

2. The garden exhibition featured talks by several plantsmen who shared their expertise with the visitors.

花园展览会上，有几位植物专家进行了讲座，与参观者分享他们的专业知识。