重点讲解：
1. be responsible for 对(某事物)负责的 ；
例句：Local authorities have been responsible for the running of schools in their areas.
地方当局一直负责管理本地区的学校(GFcq8Oc.eS0。
2. keep sb. from doing sth. 阻止（或防止、阻碍）…做；
例句：I tucked some plastic wrap around the sandwiches to keep them from getting stale.
我用塑料包装纸把三明治裹起来，防止变质djP@DW6A&9Hwb(r。
3. go down （价格、水平或数量）下降，下跌；
例句：Income from sales tax went down.
来自销售税的收入下降了2j9c5)j&4%%。
4. by any means 无论如何；
例句：You must finish the work in time by any means.
你无论如何都要及时完成这项工作t+MlN!uLP.inbc)Lb7。