endurance period的用法和樣例：
例句
- Cancer should be suspected in persons who have any of the symptoms and signs for unaccountable causes and for an unreasonable period of time.
如果病人具有任何這些癥狀和表徵，病因又難以說明，而且持續時間又很長，就應該懷疑患有癌症。 - If the scholastic achievement of highly intelligent children remains below average for an extended period, many teachers will fail to recognize their potential.
如果才智高的兒童的學習成績在持續時間內始終低於平均水平，許多教師會不認可他們的潛力。
