thousand什么时候加s

thousand在形容的数量非常大但是没有明确数量的时候加s。复数名词是指英文体系中可数名词的复数形式，而不可数名词则没有复数形式。当要表现某个可数名词所表示的数量大于一时，就要用到该名词的复数形式。

例句：The damage was such that it would cost thousands to repair.损坏严重，要修好就得花几千块钱。Thousands of working days were lost through strikes last year.去年因罢工损失了数以千计的工作日。