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棉花是一年生植物,每年4月下旬～5月上旬播种,到开花大约需要3个月的时间。不知大家有没有发现,同一株棉花上常会有几种不同颜色的花,这是为什么?
Cotton is an annual plant, which is sown from late April to early May each year and takes about 3 months to flowering. I wonder if you have not found that the same cotton often have several different colors of flowers, which is why?