药品共享冷却：同类药水的冷却组

local function drink(actor, kind)
    COOL[kind] = os.time() + 5      -- 按单品种冷却，三药轮喝
end

local GROUP = {小红 = "回血", 中红 = "回血", 大红 = "回血",
    蓝药 = "回蓝"}
local COOL = {}
local function drink(actor, kind)
    local grp = GROUP[kind]
    if (COOL[grp] or 0) > os.time() then
        sendmsg(actor, 1, grp .. "类药品冷却中")
        return
    end
    COOL[grp] = os.time() + 5       -- 整组进入冷却
end