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1. A case, comprising: a case body comprising a plurality of case sides, and a cavity enclosed by the case sides, the cavity is configured to accommodate an electronic device; a plurality of vents disposed on at least part of the case sides and configured to ventilate between the case cavity and an external space; and a water retaining mechanism disposed on an inner wall of the cavity of the case body and positioned at the vents; wherein the case body comprises a front side, a rear side, an top side, a bottom side, a left side and a right side: the front side comprises a front frame and transparent glass arranged on the front frame; and the vents are disposed on the front frame of the front side, and the water retaining mechanism is connected with the front frame; and wherein the vents comprises a first group of vents and a second group of vents; the front frame comprises an upper border and a lower border; the first group of vents are disposed on the upper border, and the second group of vents are disposed on the lower border; and the water retaining mechanism comprises: a first baffle arranged at the first group of vents on the upper border and connected with the upper border to form a first water storage portion surrounding the first group of vents; and a second baffle fixed to the bottom side and arranged opposite to the second group of vents on the lower border.
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