Takeoff is the most important technique among the others, set the body's speed and direction at the lifting moment and proceeds to determine the distance of the long jump.
起跳作为跳远运动各项技术环节中最为重要的环节，它决定了人体腾空瞬间的运动速度和运动方向，进而决定了跳远成绩的好坏。
And they emphasise the importance of medical direction and monitor to the aged long distance runners.
同时也强调了加强对老年长跑队员医务指导和监督的重要性。
Atmosphere turbulence is the major factor that affects the accuracy of the propagating direction of a laser beam, and causes serious errors in laser straightness measurement at long distance.
在激光基准长距离、高精度直线度测量中，空气扰动是影响其测量精度的一个主要因素。
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