The U. S. ace shuttle Discovery has landed safely at the Ke edy ace Center in Florida after a 13-day mi ion.
美国发现号航天飞机在完成13天的任务后，已经在佛罗里达州的肯尼迪航天中心安全着陆。
All the tra mi ion axle and rollers are made of high-quality steel with high-precision dynamic balance, plated with rigid chrome and grinded surface.
所有传动轴、辊材质均为优质钢，高精度动平衡校正，镀硬铬、表面研磨。
All the tra mi ion axle and rollers are made of high-quality steel with high-precision dynamic balance, plated with rigid chrome and grinded surface.
所有传动轴、辊材质均为优质钢，高精度动平衡校正，镀硬铬、表面研磨。
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