The other seven are tiny (an analogy might be a sheet of paper, which is two-dimensional for practical purposes, even though it does have a finite thickness).
另外7维很微小(一个可以类比的例子是纸面，通常认为是2维的，虽然它还是有厚度的，所以还是3维的)。
2
In this paper, we propose a two-dimensional risk model with thinning dependent structure and three different types of ruin probabilities are defined.
本文引入了一个含稀疏相关结构的二维风险模型，并基于此模型定义了三类不同的破产概率。
3
Completion of the NC programming system for plane engraving mentioned in this paper is based on the supporting software for two - dimensional design.