The steel structure design CAD is a complicated and huge system project dealing with Mathematics, Engineering Mechanics, Architecture and Computer Graphics.
钢结构设计CAD是一项复杂、大型的系统工程，涉及到数学、工程力学、建筑学、计算机图形学等多种学科。
Due to the complicated geological structure and huge related information, great difficulties have been encountered during the engineering design of large-scale hydraulic projects.
大型水利水电工程所处地区地质构造复杂，涉及的地质信息众多，给工程设计带来了很大的困难。
Due to the huge volume of civil engineering structure, the vibration excitation is a difficulty; the modal identification based on environmental excitation is available.
由于土木工程结构体积大、形状复杂，外加激励难，因而利用环境激励来获取土木工程结构的模态参数被认为是一种行之有效的方法。
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