X光显示如下结果，这些结论意味着什么呢？各位帮看看

No acute osseous abnormalities of the lumbar spine. Intact vertebral body heights and alignment. Moderate narrowing of the intervertebral disc spaces at L4-L5 followed by L5-S1 then L3-L4. There is disc calcification at L3-L4 and to a lesser extent at L2-L3. Mild facet osteoarthrosis at L4-S1.