在发明这些陶罐陶钵以前，人类只能将食物储存在地洞里或者树皮树藤编织的篮子里，这样很容易被老鼠之类小动物偷吃，同时也很受天气影响。 比如篮子吧，磨损得快，也容易受干受潮。
Before the discovery of the pot, people stored their food in holes in the ground or in baskets - both vulnerable to thieving creatures and, in the case of the baskets, to wear and to weather.
这种角度导致了攀岩者下降时，施加在快挂上的作用力更大，与绳子接触的那一段钩环也比其他的要磨损更严重。
This angle causes more force to be exerted against the carabiner as every climber is lowered, and this force causes the rope biner on the first draw to wear faster than other draws.
孩子们一排一排坐在课桌前，抬头看着站在被磨损得快坏了的黑板前的老师。
Children sit at rows of desks, staring up at a teacher who stands in front of a well-worn chalkboard.
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