1.gradual  [ˈɡrædʒuəl] 逐渐的，平缓的

eg.We all must die one  day,and the illness which is removing me is not  painful;it is gentle and gradual:my mind is  at rest.

总有一天我们大家都得死去。现在正夺去我生命的疾病并不痛苦。既温和而又缓慢，我的心灵已经安息。

2.profound[prəˈfaʊnd]巨大的，深刻的，知识渊博的

eg.it might be two hours later,probably near eleven,when I——not having been able to fall asleep,and deeming,from the perfect silence of the dormitory,that my companions were all wrapt in profound repose——rose softly,put on my frock over my night-dress,and,without shoes,crept from the apartment,and set off in quest of Miss Temple's room.

也许过了2个小时，可能是将近十一点了，我难以入睡，而且从宿舍里一片沉寂推断，我的同伴们都已蒙头大睡。于是我便轻手轻脚地爬起来，在睡衣外面除了件外衣，赤着脚从屋里溜了出来，去寻找坦普尔小姐的房间。

3.prolong[prəˈlɒŋ]延长

eg.To prolong doubt was to prolong hope. 延长疑虑就是延长希望。

prolong our life 延长我们的寿命