The onset of berry ripening is called véraison . This is the point during the growing season when berries start to change color (if they are a pigmented grape) and to swell and soften. At this time, the amount of sugar/sweetness level in the berries starts to [选择] decrease stabilize/remain constant increase and the acid/sourness level begins to [选择] decrease increase stabilize/remain constant . 多重下拉选择题

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