21米怎么说用英语

21 meters can be translated into English as "21 meters" or "21 metres." It's a measure of length, and is equivalent to about 69 feet. In some contexts, it might be more common to use feet or yards instead of meters, depending on the standard units of measurement being used. For example, in the United States, feet are more commonly used for measuring distances, whereas in many other countries, meters are more commonly used.