多体问题中在所有质点碰撞到一起的过程中，质点趋于组成一定的形状。
酶的催化中心是由一组氨基酸组成，其三维结构形成活性位点，允许它高效地结合或修饰底物。
The catalytic center of an enzyme is composed of a set of amino acids whose three-dimensional arrangement forms the "active-site" that allows them to efficiently bind and modify the substrate.
点传火技术是大口径火炮装药中的关键技术之一，现代火炮装药中几乎全部选择了中心点火的结构形式。
The technology of ignition and flame spreading is one of key technology of charge design in large caliber guns, which almost chose center core igniter system.
本文介绍了三轴数控加工中心的加工原理、结构形式和程序设计，以及五轴cnc加工中心机床的研究。
The paper introduces the working principle, structural form and program design of CNC machine center with three axes, and study of CNC machine center with five axes.
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