relieve a sentry

例句：

1. 1.The doctor relieved her of the pain by prescribing medication.
   医生通过开药使她的疼痛减轻。
2. 2. The traffic police relieved the congested road with a new roundabout.
   交警用一个新的环岛来缓解拥堵的道路。
3. 3. She relieved her friend of his worries by reassuring him.
   她通过安慰他来解除朋友的担忧。