在嬉皮运动的过程中大概有两个主要的因素：越南和音乐。
There were probably two major factors in the growth of the hippie movement: Vietnam and music.
十字标志是一个古老的符号，在20世纪60年代的嬉皮士运动中被用来代表和平和爱。
The ankh is an ancient symbol which was adopted by the hippie movement in the 1960s to represent peace and love.
它们的上一次流行是在20世纪60年代和70年代，第一次环保风潮和嬉皮士运动期间。
The last time they were in fashion was in the 1960s and 1970s, during the first environmental and hippy movement.
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