This paper introduces two mature sorting methods: bubble sort and selection sort, and points out that these sorting methods could be used to realize the two-direction sort.
介绍了两种较为成熟的排序方法冒泡法和选择排序法，指出这两种排序方法都可在原来基础上实现双向排序。
2
A two-direction shear deformation finite element model is presented in which a three-dimensional problem is reduced to a two-dimensional one and thus the calculation is much simplified.
文中提出了“双向剪切变形”有限元模型，使三维问题简化为二维问题，计算工作量大为减少。
3
The two-direction all - electrical gun control system reduces its weight by 40% , its volume by 30%, while its efficiency raised by 35% as compared with current tank gun control system.