They control and dominate the Baltic trade, and herring is an important part of that, because herring will keep once it's salted and all that.

他们几乎控制和掌握了整个波罗的海贸易,而鲱鱼则是其中的重要组成部分,因为鲱鱼一旦用盐浸泡过就可长期保存

耶鲁公开课 - 欧洲文明课程节选

The Dutch dominate the Baltic trade.

荷兰人控制了波罗的海的贸易往来

耶鲁公开课 - 欧洲文明课程节选