守恒

Typical chemistry students have difficulty connecting symbolic and visual representations of reactions and often fail to account for conservation of mass and the effects of heat and temperature.

典型的化学专业的学生在联系反应的符号和视觉展示方面遇到了困难，经常无法解释质量守恒定律及热量和温度的效应。

According to the Law of Conservation of Mass,we have established the mathematical model of heavy metal pollution in Le'an River,and have attempted to find the solution to it.

根据质量守恒定律，建立乐安河重金属污染数学模型，并对其进行了求解。

According to the principle of mass conservation, the dynamic model of SCF-CO_2 is set up on differential extraction base on determining the extracted conditions.

在确定了最佳工艺条件的基础上，根据质量守恒原理，建立了基于微分床萃取的超临界流体萃取动力学模型，从理论上分析了超临界流体萃取过程中各因素对提取率的影响情况，并对模型中的主要参数进行了讨论。

In chapter four, in order to study the micro-process of the compress of the high speed oil-free twin screw compressor, a mathematical model is built based on the conservation of mass and the first principle of thermodynamics.

第四章为了深入研究无油双螺杆压缩机的微观工作过程，以质量守恒定律和热力学第一定律为基础，建立了双螺杆工作过程的数学模型。

Based on the first law of thermodynamics and the law of mass conservation, thermodynamic and dynamic models of the vane compressor have been developed by considering leakage, heat transfer etc.

本文在热力学第一定律及质量守恒定律的基础上，考虑了压缩过程的泄漏、传热等现象，建立了旋叶式压缩机工作过程的热力学模型和动力学模型。

By the law of conservation of mass and the principle of effective stress as well as the equilibrium differential equation, an anisotropic coupled model for the analysis of groundwater seepage and stress is developed.

根据质量守恒定律、有效应力原理、以及土的平衡微分方程建立了各向异性渗流场与应力场的耦合分析的数学模型。

It is explained that the law of conservation of mechanical energy obeys relativity principle of mechanics.

系统地阐明机械能守恒定律无条件服从力学相对性原理。

Professor Lewin puts his life on the line in Lecture 11 by demonstrating his faith in the Conservation of Mechanical Energy.

Lewin教授在第十一讲中将他的生命系於一线之间用以证明他相信的机械能守恒定律。

Law of conservation of mechanical energy obeys the relativity principle of mechanics;2. An article in elsewhere censuring papers published in this journal is replied, discussing in detail the relation between the law of conservation of mechanical energy and the mechanical relativity.

详细阐述了机械能守恒定律成立的条件及该定律服从力学相对性原理所需满足的条件，回答了《河北师范学院学报》在1997年第2期上赵佩章等同志对本刊多年来所发表的有关文章的批评。

Key words: theorem of kinetic energy; conservation law of mechanical energy; reference frame

动能定理，机械能守恒定律应用

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷