And yet, if you take, for example, subclinical osteoporosis, a bone thinning disease, the precondition, otherwise known as osteopenia, you would have to treat 270 women for three years in order to prevent one broken bone.
然而， 如果你拿亚临床骨质疏松症做例子， 它的前兆症状， 被称为骨质减少， 你必须为270个女人提供长达3年的治疗， 来防止一个断裂的骨头。