Christopher Kettle, Biodiversity International's director for forest genetic resources and restoration in Rome, says that the need for infrastructure — things such as mechanisms for collecting and storing seeds, and nurseries to raise seedlings — might be most desperate here because many trees are 'masting' species, which don't produce seeds every year.
罗马生物多样性国际组织森林遗传资源与恢复主任克里斯托弗·凯特尔表示,基础设施的需求——例如收集和储存种子的机制,以及培育幼苗的苗圃——在这里可能最为迫切,因为许多树木是“ mast 结实”物种,它们不是每年都产种子。
主语 "the need for infrastructure" 与谓语 "might be" 之间被长达二十多词的同位语插入成分(破折号之间的部分)分隔开。这种分隔使得读者需要跳过中间的长修饰成分才能找到主干谓语,增加了句子理解难度。本该相邻的主谓被拉开,是典型的分隔结构。