In English, the year 2000 can be referred to as "the year 2000" or "the year two thousand". It is derived from the way the numbers are written in English, with "twenty" being used to refer to the number 20 and "hundred" being used to refer to the number 100. For example:

"I was born in the year 2000." (我出生在2000年。)

"The year 2000 marked the beginning of the new millennium." (2000年是新千年的开始。)

"The year 2000 was a leap year." (2000年是闰年。)

It is also worth noting that in English, the year is typically written with commas, so it would be written as "2,000" rather than "2000". For example:

"In 2,000 B.C., the first pyramids were built in Egypt." (在公元前2000年，埃及建造了第一座金字塔。)

"The population of the United States in 2,000 was approximately 281 million." (美国在2000年的人口大约为2.81亿。)