在拉引推竿阶段中后期运动员身体普遍明显前伸，进而揭示出我国优秀运动员在利用撑竿的弹性和控制身体的能力等方面所存在的缺陷。
This showed that the top vaulters of China had some defects in utilizing the elasticity of the pole and in exercising control over their bodies.
那连接竿送活塞的上上下下运动到机桥，将它换成旋转的运动。
The connecting rod transmits the up-and-down motion of the piston to the crankshaft, which changes it into rotary motion .
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