16. cover
(1)封面。
hard cover 精装书，与hard back book同意。
另外，每个娱乐杂志的封面都免不了会有一位漂亮时尚的cover figure(封面人物)。
The hard cover is on sale for the same price as the paperback this week in the bookshop.
在书店，这些精装本与平装本价格相同。
(2)读完，完成。
I think we've covered everything.
我认为我们完成所有事情了。
I just covered a few chapters which interested me most.
我只读完了自己最感兴趣的几章。
17. crossword puzzle
纵横字谜，一种填字游戏，。既可以entertain oneself(自我娱乐)，也是一种不错的智力训练。
This is not a game. It's only a crossword puzzle that helps increase my vocabulary.
这不是游戏。这只是可以帮助我提高单词量的一种纵横字谜。