_Many thousands of_books must bu produced for the children.为什么不是Many thousand of?

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_Many thousands of_books must bu produced for the children.为什么不是Many thousand of?
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_Many thousands of_books must bu produced for the children.为什么不是Many thousand of?
_Many thousands of_books must bu produced for the children.为什么不是Many thousand of?

_Many thousands of_books must bu produced for the children.为什么不是Many thousand of?
因为many 是约数,好几千,不是一个具体数,只要不是具体数,thousand,hundread,billion,million等数词都要加s,除了several.后面加的数词意义虽然是约数,但不能加s