重点讲解：
1. for free 义务地；无偿地；免费地；
例句：Meanwhile I was a film critic. I didn't get paid, but I got to see movies for free.
同时我曾经是个影评人，虽然我不赚钱，但我可以看免费的电影,g.pMTz+vv.%Y。
2. to death (用于形容词或动词后，表示强调)；
例句：I dropped out of high school. It bored me to death.
我从中学退学了，那种学校生活令我烦得要死p1cCuKWD-3Gy|JUO[T%)。
3. look back 追忆；回顾；
例句：As I look back, scenes of the past leap before my eyes.
追忆往事，历历在目xJyr-#qZIl6IyH+,jx_l。
4. in public 公开地；当众；
例句：Inarticulate and rather shy, he had always dreaded speaking in public.
他不善言辞又相当害羞，一直害怕在公共场合讲话riD2&tURjT5@9vX_VCA;。