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重点讲解：
1. block up （使）封闭；（使）堵住；（使）封死；
例句：'Any holes in the kitchen where the mice are getting through?' – 'I've blocked them up.'
“厨房里还有没有老鼠洞？”——“我已经把它们堵死了。”
2. at the expense of 以…为代价；
例句：He finished the job at the expense of his health.
他以自己的健康为代价完成了工作。
3. be good for 有利的；有益的；
例句：Cereal products are good for our health.
谷物产品对我们的身体有益。
4. figure out 想出；理解；弄清；
例句：They might have figured out this riddle by now.
他们现在也许已经解开这个谜了。
n. 谜，谜语
vt. 解谜，出谜题，充满，打
