approximate rule

例句：

1. 1. The price of the house is approximately $500,000.
   这所房子的价格大约是50万美元。
2. 2.The distance between the two cities is approximately 300 miles.
   这两个城市之间的距离大约是300英里。
3. 3.The time difference between these two countries is approximately 4 hours.
   这两个国家之间的时差大约是4小时。