The fault movement and the direction of principal stresses may be determined by considering the relationship between the different secondary structures and en-echelon patterns.

因此可以通过这些次级构造和雁列类型的关系，来判断断层的运动和主应力方向。

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Human, whose basic characters of vital movement are shown by his substance metabolism processes, are the principal of aerobic gymnastics.

健美操运动的主体是人，人体的物质代谢是生命活动的基本特征。

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Significant fluctuation with a time-scale of several years exist in the crustal movement, which might be a principal feature for the continental crustal movement;

地壳运动存在着数年尺度的较明显的波动性，这可能是大陆地壳运动的一个主要特征；

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"Monitoring cardiorespiratory health and stress levels are an important yet neglected aspect of understanding one's health and wellness progression which is in line with the Quantified Self movement" said Juliana Chua, Principal of Zensorium's Business Innovation Group.

ENGADGET: Zensorium launches Tink�� cardiorespiratory health and stress monitor for iOS devices (video)

Martin Luther King's principal lieutenants during the civil rights movement, Abernathy became the target of an investigation after a state worker alleged that he had instructed her to file for expenses he was not entitled to receive.

CNN: Georgia legislator, son of civil rights leader, indicted