科幻小说中的太空食品一般要么是味同嚼蜡的预制的正方体，要么就是一盘一盘的地球美食的高科技复制品。
Science fiction tends to present space food as either flavorless, prefabricated cubes or plates of luscious Earth food that magically appear out of high-tech replicators.
做豆腐时先用水浸泡大豆12 ~ 24小时，然后把已经泡软的大豆磨碎，做成横6cm，竖10 cm、高4cm的四角正方体。
To make tofu, first soak beans in water for about 10 to24 hours. The softened beans are boiled, and then formed into blocks 10cm by 6cm by 4cm.
一个正方体的棱长是5厘米，它的所有棱长之和是多少厘米？
The length of a cube is 5cm. What's the sum of all its edges ?
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