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There is only one difference between an old man and a young one:

老年人和年輕人之間僅僅有一個不同：

until bit by bit the walls of the ego recede,

直到自我的圍墻一點一點地倒塌下來，

In another game, as the turtle swims across the oceanarium, the first porpoise swoops down from above and butts his shell with his belly.

在另一場游戲中，當海龜游過水族館時，第一只海豚從上方猛撲下去，用腹部撞擊龜殼。

and the existence of underwater features of considerable magnitude.

水下特征差異極大。

and is still non-existent in a number of 'civilized' nations.

今天，在許多文明國家里，義務(wù)教育迄今尚未實行。

They have also assumed that all animals, and probably other organisms such as trees,

人們不但認識到所有的動物，大概也認識到所有的有機物，如樹木，