十字军东侵是怎么回事？
第四次十字军东侵对拜占庭国家来说十一个规模空前的巨大灾难。
The Fourth Crusade was a disaster of unprecedented dimensions for the Byzantine state.
我们一起追根溯源到12 、13世纪和“十字军东侵“时期，参加东征的农奴不断放弃农田，给封建主义以沉重的打击。
Tracing to its source to join us in 12, the 13th century and "Crusades" period, the serfs continue to participate in the east to give up farmland, to feudalism in order to deal a heavy blow.
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