to reduce the price of something, usually in order to encourage people to buy it

Low consumer demand has forced us to mark down a wide range of goods, sometimes by as much as 30 percent. 低迷的消费需求迫使我们降低了许多商品的价格，有时降幅高达30%。

Shares in the electricity companies were marked down following the announcement of the new energy tax. 电力公司的股价在新的能源税颁布后随即纷纷下跌。

to write something on a piece of paper in order to make a record of it

I've marked down the number of each item sold. 卖出去的每件东西的号码我都记下来了。

Look carefully at these questions and mark your answers down in the right-hand column. 仔细审题，然后在右栏中写下答案。