For people who have already contracted an opportunistic infection and undergone successful treatment, secondary prophylaxis may be advisable to prevent recurrence.
对于曾经患过机会感染和并有成功的治疗的人，推荐使用二线预防，以防止复发。
2
The naive implementation of this recurrence relation as a recursive method would have led to an inefficient solution involving multiple computations of subproblems.
用递归方法对这些递归关系的直接实现会造成解决方案效率低下，因为其中包含了对子问题的多次计算。
3
Among tamoxifen users, those who had highest intake of daidzein, metabolite of soy protein, were 52 percent less likely tohave breast cancer recurrence compared to those with lowest intake.