帮我解释一下这个名词所有格形式About 347 million cubic meters of earth was moved during the 31-months'time of preparationwork.这里的31-months'不是说数词-名词做定语时名词不加s么?还有31-month不就是个定语,怎么

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帮我解释一下这个名词所有格形式About 347 million cubic meters of earth was moved during the 31-months'time of preparationwork.这里的31-months'不是说数词-名词做定语时名词不加s么?还有31-month不就是个定语,怎么
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帮我解释一下这个名词所有格形式About 347 million cubic meters of earth was moved during the 31-months'time of preparationwork.这里的31-months'不是说数词-名词做定语时名词不加s么?还有31-month不就是个定语,怎么
帮我解释一下这个名词所有格形式
About 347 million cubic meters of earth was moved during the 31-months'time of preparation
work.
这里的31-months'不是说数词-名词做定语时名词不加s么?还有31-month不就是个定语,怎么还用名词所有格的形式?

帮我解释一下这个名词所有格形式About 347 million cubic meters of earth was moved during the 31-months'time of preparationwork.这里的31-months'不是说数词-名词做定语时名词不加s么?还有31-month不就是个定语,怎么
这个词的意思是:3个月的时间,是一个归属,一定要用名词所有格的形式.