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重点讲解：
1. ask sb. a favor 请某人帮忙；
例句："I want to ask you a favor," I whispered to him.
“我想请你帮个忙。”我低声对他说。
2. write down 写下；记下；
例句：Children write down the word, cover it up and then try to spell it from memory.
孩子们把这个词写下来蒙住，然后试着凭记忆拼出来。
3. pick up 拿起；提起；拾起；捡起；
例句：They depend on the goodwill of visitors to pick up rubbish.
他们相信游客会自觉捡起垃圾。
4. check out 了解清楚；核实；查实；
例句：I check out place to eat in a magazine.
在杂志上查用餐场所。
n. 垃圾，废物，废话
v. 贬损
