TPO中一个句子求理解分析

咪咪啦

TPO17，第一篇文章 Europe's Early Sea Trade with Asia， 第2段，困惑句子见highlight部分

The chief problem was technological: How were the Europeans to reach the East? Europe's maritime tradition had developed in the context of easily navigable seas—the Mediterranean, the Baltic, and to a lesser extent, the North Sea between England and the Continent—not of vast oceans. New types of ships were needed, new methods of finding one's way, new techniques for financing so vast a scheme.

意思很好理解，无非是船、方法、技术都是必须的，但是我不是很明白这个句子的语法，后面的“methods” 和 “techniques” 都没有谓语？也没有迹象它们和“types”并列做主语啊…………

求分析！！？？

咪咪啦

求帮助啊，自己顶一个