由于只有骨折了，你才知道骨质疏松症之前是常毫无症状的发生了。唯一鉴定的办法是做一个骨头无机密度检测。
Because osteoporosis often causes no symptoms at all until a fall snaps a bone, the only way to tell if you have it is via a bone mineral density test.
无症状COPD患者由于没有症状，很少到医院就诊，但在流行病学调查中却易于检出。
They seldom went to hospital because of no symptoms. However they are easy to diagnose with COPD in epidemic survey.
这可以部分解释这个病人无症状是由于游离体在椎管的侧方。
This may partially explain the absence of symptoms in our patient due to the position of the loose body in the lateral side of the canal.
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