step by step exchange

基本解释

It is main method for STEP to implement product data exchange by database exchange.
数据库交换方式是STEP实现产品数据交换的主要方式。
The results showed that boron separation by the two-step ion exchange for isotopic measurement was more effective. It achieved high accuracy of isotopic measurement of boron.
采用二次离子交换法分离天然样品中的硼是一种更有效的从天然样品中分离和纯化硼的分离方法，因而，也进一步提高了硼同位素组成测定的测量精度。
In recent years, with the expansion of China foreign economic cooperation exchange step by step, the environment questions have been brought more and more attention to academic circles.
近年来，随着中国对外经济合作交流的逐步扩大，环境问题已越来越引起学术界的广泛注意，环保也成为“两会”的热点话题。