1. Go on to do sthbdo sth after completing sth else 
   完成一事後接著做某事
2. He bought oil-company shares on spec. 
   他买入石油公司股票进行投机。
3. Build sth on sthbbase sth on sth 
   把某事物作另一事物的基础
4. Do sth. on one's own responsibility 
   自己负责，尽责
5. Blook to sb for sth; Blook to sb to do sthbrely on or expect sb to provide sth or do sth 
   依赖或指望某人提供或做某事物

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