论文部分内容阅读
蜗牛从9厘米深的碗底往上爬,每爬3厘米要用3分钟,然后停2分钟。请问蜗牛从碗底爬到碗口要用多长时间?
The snail climbs from the bottom of the bowl, 9 centimeters deep, for 3 minutes for each 3 centimeter climb and then for 2 minutes. Will the snail crawl from the bowl to the mouth to use how long?