# 文波PTE真题视频系列-RL-005-4 dimensions

5 dimensions

Dimensions can be defined as the number of space or variables used to describe events. One dimension refers to one variable, which means longitude. Two dimensions contain two variables: namely, longitude plus latitude. Three dimensions contains 3 variables: longitude, latitude and velocity: Four dimensions include the above- mentioned variables and time. We can use these dimensions to represent every event; however, we seldom use 4 dimensions.