这个场景对很多工程师都不陌生：一个系统模型包含一个核心实体结构，该实体具有一组事件，这些事件组成了实体的生命周期。
This scenario is familiar to most engineers: a system model has a given core entity structure with a given set of events that form a lifecycle.
她说，在线课程开始逐渐对实体课堂进行补充，但是这会给所有方面带来变化，从学校每天的课程表变化到校舍结构的变化。
Online classes will begin to supplement the physical classroom gradually, she said, but will lead to changes in everything from the schedule of the school day to the architecture of school buildings.
本文基于ANSYS软件建立了车架结构的实体单元模型，对汽车车架结构进行静力和动力分析的研究。
This article, based on ANSYS software, has set up the entity unit model of the frame structure, and made a research on static and dynamic analysis.
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