第二个主要的设计进步是Erich Gamma关于软件模式的前期工作。
A second major design advance was the pioneering work of Erich Gamma on software patterns.
本文的研究成果为“西气东输”工程的规划设计以及俄罗斯输气工程的前期工作提供了技术支持。
The outcomes of the research have provided technical support for both planning design of "the Gas Transmission from West to East" project and the early-stage work of Russian Gas Transmission project.
传统旋风铣削刀具设计方法计算繁杂、重复多、效率低，运用软件检测分析时前期工作量大。
The traditional method of designing whirling tools is complicated in calculation and low in efficience.
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