1、The arboriculturist advised us on the proper care and maintenance of our trees.
树木专家对我们的树木的适当护理和维护提出了建议。

2、As an arboriculturist, he has extensive knowledge of different tree species and their growth patterns.
作为一名树木专家，他对不同树种及其生长模式有着广泛的知识。