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我们都知道,算盘的上档有一个空位,下档有两个空位,这样,就可以噼里啪啦地打算盘了,算盘才有用处。倘若把算盘的空位都填满算珠,没有了空位,这个算盘就成了废物。凡是有经
We all know that the abacus has an open seat on the upper deck and two empty seats on the lower seat so that the plate can be crackled and the abacus useful. If the abacus vacancy are filled with beads, there is no vacancy, the abacus became a waste. All have been