重点讲解：
1. sit back
宽舒地休息； 不采取行动；
eg. I like to sit back and rest in the evenings.
我喜欢在晚上什么也不做，好好休息。
eg. Get on with the work—this is no time to sit back.
好好干活，现在可不是坐着休息的时候。
2. be sick of
厌倦的；厌烦的；厌恶的；
eg. I am sick and tired of hearing all these people moaning...
我厌倦了听这些人大发牢骚。
eg. Most people here are sick of violence.
这儿的大多数人都厌恶暴力。
3. be impressed with
对……有印象；
eg. We were deeply impressed with this sight.
这风景给我留下了深刻的印象。
eg. I was deeply impressed with the changes brought about by the project.
这一工程带来的变化给我们留下了很深的印象。
