重点讲解：
1. be proud of
为…而感到骄傲；自豪；
eg. He was justifiably proud of his achievements.
他有理由为自己的成就感到骄傲。
eg. He is proud of his great success in scientific researches.
他为自己在科研方面所取得的巨大成就而自豪。
2. come out
（书或光盘）出版，发行；
eg. The book might come out in paperback soon.
这本书不久可能以平装本出版。
eg. These new products will come out before long.
这些新产品不久将要上市销售。
3. tend to do sth.
往往会；经常就；
eg. Television companies tend to censor bad language in feature films.
电视公司往往会在审查故事片时删去其中的粗话。
eg. Like causes tend to produce like results.
类似的原因往往产生类似的结果。
