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这是一次自发的活动。
It was quite spontaneous.
youdao
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采取的活动，通过副交感神经系统的地方是自发发生的事情。
The activities that take place through the parasympathetic system are spontaneous happenings.
youdao
-
采取的活动，通过副交感神经系统的地方是自发发生的事情。
The activities that take place through the parasympathetic system are spontaneous happenings.
youdao