When you see an old man or old woman walking down the street, its back bend forward almost to an L-shape, you are seeing a person in an advanced state of osteoporosis.

• 当你遇到一位行走在大街上、脊柱几乎弯曲成L型的老年男性或女性，那么他/她就已经出现骨质疏松的先兆了。