电波望远镜就这样出现了，它被认为是二十世纪最伟大的发明之一。
The radio telescope thus appeared, and it is considered one of the greatest inventions in the twentieth century.
它被认为是最好的利用还因为它是这样一个低水平的。
It is considered one of the best exploits yet because it is such a low level one.
所以当看到这样的猫，它被认为是女巫的化身。
Thus when such a cat was seen, it was considered to be a witch in disguise.
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