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For experimental purposes, scientists originally assumed that photoperiodism worked through photosynthesis. 爲(wèi)了進(jìn)行實(shí)騐，科學(xué)家們最初曾經(jīng)設(shè)想，光周期現(xiàn)象可能是通過(guò)光郃作用實(shí)現(xiàn)的。