求翻译：相反，一战之后中国爆发的五四运动，新文化运动和20世纪20-30年的中西文化之争，美国人一度民主和自由的象征被殖民主义和帝国主义所替代。是什么意思？

On the contrary, a war broke out in China after the May Fourth Movement, the New Culture Movement and the 20th century, 20-30 years of East-West struggle, the Americans once the symbol of democracy and freedom is replaced by colonialism and imperialism.

In contrast, a war broke out in China after the New Culture Movement, movement and 20 54 20 - 30 century the Chinese and Western cultures, a struggle between democracy and freedoms Americans once the symbols have been replaced by colonialism and imperialism.

On the contrary of, after as soon as fights China erupts the May 4th Movement of 1919, struggle the New Culture Movement and the 20th century 20-30 year China and the West culture, the American once democracy and the free symbol substituted by the colonialism and the imperialism.

Instead, the movement of China after World War I broke out, the new culture movement and the 20th century and a half years of dispute between Chinese and Western culture, Americans were once symbols of democracy and freedom were replaced by colonialism and imperialism.

Instead, the movement of China after World War I broke out, the new culture movement and the 20th century and a half years of dispute between Chinese and Western culture, Americans were once symbols of democracy and freedom were replaced by colonialism and imperialism.