Qinghai Lake, the largest saltwater lake in China, is 3 193 meters above sea level, which means +3 193 meters with positive or negative numbers.
Guangxin Clothing Store made a profit of 3,000 yuan this year 1 month, and recorded it as+3,000 yuan. In March, it was-1.800 yuan, indicating that this clothing store lost money in March 1.800 yuan;