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单词 pebble grain
例句
原声例句
十万个为什么

Sand is made when rocks are slowly whittled down into tiny little pebble grains.

当岩石缓慢地被磨成细小的卵石颗粒时,就形成了沙子。

剑桥雅思阅读

Counting is not directly related to the formation of a number concept because it is possible to count by matching the items being counted against a group of pebbles, grains of corn, or the counter's fingers.

数数与数字概念的形成并无直接联系,因为通过把所数物品与石头,玉米粒或者手指匹配在一起,也可以数数。

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