They also sayah sex sponsors should reconsider the usual financial and time constraints placed on investigators conducting HIV-prevention trials. 他们还说，研究资助者应该重新考虑对从事艾滋病临床研究的科学家的常规财务和时间约束。
The definition of time constraint was put forward considering the impact of the length of the time's compartmentalization and the self-learning function of the system was realized. 由于行为轨迹中时间段划分跨度对推荐源数据实用价值存在影响，故提出了时间约束定义，同时完成了该算法中自动学习功能的实现。
