In China,Liu Xiang( )"Flying Man”.在中国,刘翔被称为飞人.填空,具体讲讲为什么

答案是：
In China,Liu Xiang ( is called ) "Flying Man”.
或者：
In China,Liu Xiang ( is known as ) "Flying Man”.
解析：
be called .
be known as .
是词组,“被称为”、“被称作”的意思