two,three,four,five,six,seven,eight,nine thousand后面要不要加s

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two,three,four,five,six,seven,eight,nine thousand后面要不要加s
two,three,four,five,six,seven,eight,nine thousand后面要不要加s

two,three,four,five,six,seven,eight,nine thousand后面要不要加s
thousand后面不用加s
在表示成千上万的时候 要加s 比如tens of thousands of sth