longitudinal leaf spring 纵向钢板弹簧
longitudinal shrinking spring 纵向弹簧
longitudinal semi-elliptic spring 纵向半椭圆形钢板弹簧
The relation between speed of longitudinal waves and spring parameters has been known theoretically and it has been verified by our experiment.
得到了弹簧上纵波传播速度与弹簧参量间的理论关系，并从实验上进行了验证。
The Chun Qiu (Spring and Autumn Annals)provides longitudinal material for comparison and collation in the study of the astronomy and calendar of State Lu.
《春秋》为鲁国天文历法的研究提供了纵向对勘的资料 ，春秋时期是由观象授历到科学历法过渡的重要阶段。
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