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.

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B只有你的哥哥在洛杉矶！他是唯一要旅行才能看望家人的人。

B Apart from your older brother in LA! He's the only one who has to travel to see his family.

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你必须渡过这些难关，“苦其心智”是你唯一能够获得一颗更加强大的内心的方法，只有这样你才能够在生活中更加从容的面对痛苦，从而获得幸福的生活。

You have to pass through this vicious cycle and in this way only, you acquire mental strength to become stronger to lessen the gravity of distress so as to enjoy a happy life.

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