英语翻译

英语翻译
Decisions in life are rarely black and white but usually involve shades of gray.When it's time for dinner,the decision you face is not between fasting or eating like a pig,but whether to take that extra spoonful of mashed potatoes.When exams roll around,you decision is not between blowing them off or studying 24 hours a day,but whether to spend an extra hour reviewing your notes instead of watching TV.Economists use the term marginal change to describe small incremental adjustment to an existing plan of action.
请翻译When exams roll around,you decision is not between blowing them off or studying 24 hours a day,but whether to spend an extra hour reviewing your notes instead of watching TV.一句,并指出blowing them off在文中的含义,说明blowing them off中them指代什么.
麻烦高手了.