The value orientation of curriculum is reasonable in the specific historical periods, but along with the change of time and condition, it will inevitably change and adjust correspondingly.

课程的价值取向在特定的历史时期是合理的，但随着时代和条件的变化，必然会进行相应的改变和调整。

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The stress characteristics of vertically-fractured gas well and the main factors affecting the change of stress value and the stress orientation are studied systematically.

系统研究了垂直裂缝井重复压裂前应力场的分布特征及其影响重复压裂气井应力大小和方向变化的主要因素。

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Value orientation of young people is a kind of sensitive refraction of the change of social values orientation and also a kind of epitome of social change.

青年价值取向既是社会价值观念变迁的一种敏感的折射，同时，也是社会变迁的缩影。

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