针对目前我国交通安全评价方法存在的缺陷，运用系统动力学原理，建立了交通安全度评价的安全因数方法。
The safety coefficient method, which is aimed to construct the evaluation of traffic conditions using system dynamics, is proposed to modify the drawbacks of the current evaluation of traffic safety.
在当今中国的劳动力市场上存在一种重要的实证现象，即人们根据比较优势原理对教育水平进行选择。
People sort into schooling on the basis of the principle of comparative advantage, which we document to be an empirically important phenomenon in modern Chinese labor markets.
例如，早在热动力学解释了蒸汽机操作的物理原理之前，蒸汽机已广泛存在。
The steam engine, for example, was commonplace before the science of thermodynamics elucidated the physical principle underlying its operations.
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