首先，本文基于虚功原理，推导了结构几何非线性方程，指出更新的拉格朗日列士法U。

First of all, the nonlinear equation of structure is presented in this paper based on virtual work principle. It is thought that the Updated Lagrangian Formulation u.

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弗吉尼亚州费尔法克斯郡的乔治·马松大学，研究幸福感的心理学副教授托德。凯士丹说，这些发现意义重大，虽然他还没有看到这项研究。

Although he has not read the study, Todd Kashdan, an associate professor of psychology at George Mason University in Fairfax, Va., who studies well-being, says these findings make perfect sense.

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职业健康安全法(2000)以注意义务的原则为基础，涉及新南威尔士州的所有工作场所。

The Occupational Health and Safety Act (2000) is based on the principle of duty of care and covers all workplaces in NSW.

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