4．back out 决定不履行(允诺的事)

　　5．get across 使理解(某事)

　　6．in turn 轮流

　　7．break out (坏事)突然发生，爆发

　　8．put into prison 关进监狱

　　9．stand by 坚持(某种)说法

　　10．leave out 省略

　　1. Extreme sports have become popular in the last ten years.

　　在过去的十年里，极限运动变得很流行。

　　[句式分析]　"in the last ..."意为"在过去的......时间里"，通常与现在完成时态连用。

　　[佳句赏析]　在过去的十年中，经济危机一直困扰着欧洲。

　　In the last decade, economic crisis has been troubling Europe.

　　2. But it's worth waiting for.

　　但是这值得等。

　　[句式分析]　be worth doing表示"值得做某事"，worth后的动名词只用主动形式。

　　[佳句赏析]　电影《2012》给我们的启示很值得考虑。

　　What the film 2012 intends to tell us is well worth thinking of.

　　3. Although people enjoyed reading his book, many of them thought that Marco's stories about China were too fantastic to be true.

　　虽然人们爱读他的书，但许多人认为马可写的关于中国的东西太离奇而不可信。

　　[句式分析]　although在此引导让步状语从句，意为"虽然，尽管"，不能与but, however连用。

　　[佳句赏析]　虽然中国正变得越来越强大，但它仍然落后于发达国家。

　　Although China is getting stronger and stronger, it still falls behind developed countries.