✔ 最佳答案
"thousand" is a noun.
1) If you use it as a COUNTABLE noun (e.g. . 一千;一千個 ), it ISN'T required to add "s" at the end of the word.
e.g. The town has a population of ten thousand. 這個鎮有一萬人口。
If you use it as a UNCOUNTABLE noun(e.g數千;許許多多,無數)., it IS required to add "s" at the end of the word.
e.g. The flood took away thousands of lives. 洪水奪走了成千上萬人的生命。
Thus, two thousand is correct, i.e. no "s" at the end of thousand