[turbulence] 《诗.大雅》有《板》、《荡》两篇,都是写的当时政治黑暗,政局动乱。后用指政局混乱、社会动荡
疾风知劲草,板荡识忠臣
第一次是五胡乱华的中原板荡时期，构成我国文化主体的汉族文化的南迁。
The first one took place in the turbulent period when five minority nationalities from north came to disturb China , which had made the main part of Chinese culture , i.e. the culture of Han move southward .
板荡