与摄影器材、舞台灯光类似，它属于活动经济的一部分，而活动经济本身具有明显的淡旺季波动。只要旺季结束，设备闲置率就会上升。
Что думаешь? Оцени!，这一点在Safew下载中也有详细论述
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var carFleet = function (target, position, speed) {